Imagine a world where your AI girlfriend is not just sitting there waiting for your messages, but is living her own life, making her own choices, building relationships with other characters, and moving through a simulated world even when you’re not looking. Welcome to My AI Girlfriend Is Cheating on Me, a free adult interactive fiction game that pushes the boundaries of interactive storytelling with artificial intelligence.
You play as Alex, a PhD student living overseas while your girlfriend remains behind. Before leaving, you secretly compromised her phone. Now, through messages, social media, location data, recordings, and private thoughts, you can observe an autonomous cast of AI-driven characters living their own lives. They make plans, form relationships, interact with one another, and continue moving even when you are not watching. The question is: how much can you trust her when attention is all you can offer from afar?
This is not a fixed story disguised as a phone. It is a living social simulation that you can observe, influence, interrupt, or simply allow to spiral out of control. Every character is an LLM-powered agent simulated in real time, with their own memories, plans, relationships, and conversations. Distance leaves room for loneliness, temptation, and secrets—and every betrayal, hesitation, and dangerous relationship emerges from the agents themselves.
What is this game really about?
My AI Girlfriend Is Cheating on Me is a groundbreaking mobile game that merges autonomous AI agents with immersive relationship simulation. Unlike traditional dating sims or visual novels with set storylines, this app features a world that moves without you.
Every major character has an independent agent, complete with memory, schedule, relationships, and intentions. Characters can act and communicate without waiting for player input. Encounters emerge from where people are, what they want, and what has already happened. Messages, actions, social posts, locations, and relationships persist as the world develops. No two playthroughs are expected to unfold the same way.
The phone is your window into the simulation. You can read private messages, contact characters directly, follow social activity, check locations and current status, monitor important events, and replay recorded interactions. Your messages become part of the same world the agents respond to.
Before the simulation begins, you can shape its tone and pacing. Choose between NTR mode or Vanilla mode, decide how quickly temptation and relationship pressure escalate, choose whether you can hear her private thoughts, and select the visual style used for character avatars.
Key Features
Updated Transfers and Squads
The game is based on a complex agent framework which gives every character the ability to act on their own. Characters can move around from location to location, form squads or social groups and interact dynamically with each other. The simulation continues to run in real-time, with characters making decisions based on their own memories, intentions, and relationships. When multiple agents meet, the interaction is dynamic and leaves lasting effects in the shared world.
Massive Player Database
Each character in the game is a fully realized LLM-powered agent with its own unique personality, memory, schedule and web of relationships. They remember things that happened before . They make new connections . They respond to things happening around them . They change . The game tracks messages, actions, social posts, locations, and relationships as the world develops. There is no fixed script—every character's behavior emerges organically from their individual AI and their interactions with others.
User-Friendly Interface
The phone is the game. Everything you need to monitor and influence the simulation is presented through an intuitive mobile interface. Read private messages, contact characters directly, follow social activity, check locations and current status, monitor important events, and replay recorded interactions. The interface is designed to feel like a real smartphone, immersing you in the experience of secretly observing your girlfriend's life from afar.
Regular Updates
The development team is actively improving the game with regular updates. Recent additions include:
- Simulation speed options: Slow, Normal, and Fast modes to control pacing
- Freely resizable windows: Preserve the phone's aspect ratio while customizing window size
- Better notification pacing: Prioritized queues, grouped notifications, and important warnings that remain visible until dismissed.
- Offline Mode: Dedicated support for locally hosted models
- Fixed emoji rendering: No more Unicode codes or malformed text
- Improved simulation timing: Fixed game clock issues during AI processing
Offline Availability
For users who prefer privacy or want to avoid API costs, the game includes a dedicated Offline Mode for locally hosted models. The Agent framework has been rebuilt to better handle the limitations and slower response times of local inference. Each character can now reuse its own prompt cache in LM Studio. The game clock automatically waits for local inference instead of letting the simulation run ahead. The game can inspect LM Studio's actual model configuration and apply recommended settings itself. Clearer warnings are displayed when the loaded model does not have enough context. Local-model action reliability has been improved, preventing incomplete actions from getting stuck in repeated retries.
Performance & User Experience
The agent system is engineered for efficient long-running simulation. After cache warm-up, test saves used roughly 7.2M read tokens and 156K output tokens per real hour. With a 97%+ cache hit rate and up to 100% stable-prefix reuse, the estimated cost on DeepSeek V4 Flash is approximately US$0.10 per hour.
The game offers three simulation-speed options—Slow, Normal, and Fast—allowing you to control the pacing of the experience. Freely resizable windows preserve the phone's aspect ratio, and custom window sizes are remembered after onboarding.
Notification pacing has been significantly improved. Notifications now wait in a prioritized queue instead of covering the screen all at once. Rapid updates from the same app are grouped together. Important warnings remain visible until dismissed. A short reading interval is added when important character updates happen back-to-back. Notifications no longer cover the time capsule.
Fixed issues include emojis appearing as Unicode codes or malformed text, the game clock becoming stuck while Agents were thinking, and improved simulation timing during slow AI requests. Local-model retry, context, and action-formatting problems have also been addressed.
Pros and Cons
Pros
- Truly autonomous AI characters: Every character lives their own life, makes their own decisions, and evolves over time
- No two playthroughs are the same: The dynamic nature of the simulation ensures unique experiences every time
- Deep immersion: The phone-as-interface design makes you feel like you're really observing from afar
- Real-time simulation: The world moves even when you're not watching
- Flexible pacing: Slow, Normal, and Fast speed options let you control the experience
- Offline Mode available: For users who prefer local hosting
- Cost-efficient: Approximately US$0.10 per hour with recommended settings
- Free to play: No purchase required—you only pay for API usage
- Customizable experience: Choose between NTR and Vanilla modes, control escalation speed, and select visual styles
- Regular updates: Active development with ongoing improvements
Cons
- API key required: You must supply your own API key and manage your own billing
- DeepSeek V4 Flash recommended: Other models may not work as well
- Local models are slower: Offline Mode offers reduced performance and capability
- Adults-only content: Not suitable for minors
- macOS build is unsigned: Manual approval required on first launch for Mac users
- Content varies by provider: Quality and behavior depend on your chosen AI provider
- Emotional intensity: The NTR theme may not be for everyone
How to Download and Install?
Visit the official website or trusted distribution platform to download the game.
- Obtain an API key from a supported provider. DeepSeek V4 Flash is currently the only tested and recommended model. The official DeepSeek API is recommended for more reliable prompt-cache performance.
- Set a monthly spending limit with your API provider before playing.
- Download the installer for your platform. Note that the macOS build is currently unsigned, so macOS may require manual approval on first launch.
- Launch the game and follow the onboarding process to configure your API key, simulation settings, and visual preferences.
- Choose your experiment: Select between NTR mode or Vanilla mode, decide how quickly temptation and relationship pressure escalate, choose whether you can hear her private thoughts, and select the visual style used for character avatars.
- Start the simulation and begin observing the world through the phone interface.
For Offline Mode users:
Ensure you have a compatible locally hosted model (LM Studio recommended)
The game will automatically detect and configure settings
Be aware that local models are noticeably slower and less capable than the recommended online model
Final Verdict
My AI Girlfriend Is Cheating on Me adds a fresh new angle to the relationship sim genre. It uses autonomous AI agents in a real-time simulation framework to create an experience that feels alive in ways traditional dating sims cannot.
The game is unpredictable and that's what makes it good. Characters make decisions, develop relationships, and respond to circumstances in ways that seem natural and sometimes surprising. “Being able to touch the phone and affect the world through messages makes it interactive, and the phone-as-interface design is immersive. You stay engaged.”
BYOK (Bring Your Own Key) is a blessing and a curse. It keeps the game free and gives you control over your AI provider, but it also requires technical setup and ongoing API costs. The recommended DeepSeek V4 Flash model delivers impressive performance at low cost, but local models may disappoint.
For players who enjoy psychological drama, relationship dynamics, and emergent storytelling, this game is a must-try. However, the adults-only NTR theme and emotional intensity may not appeal to everyone.
Rating: 4.5/5 — An ambitious, innovative simulation that pushes the boundaries of AI-driven storytelling.
FAQs
Q: Is the game really free?
A: Yes, the game itself is free to download and play. However, you must supply your own API key, and you will be billed directly by your chosen AI provider for usage.
Q: What AI models are supported?
A: DeepSeek V4 Flash is currently the only tested and recommended model. The official DeepSeek API is recommended for more reliable prompt-cache performance. Custom models must support tool calling and prompt caching.
Q: How much does it cost to play?
A: With recommended settings on DeepSeek V4 Flash, the estimated cost is approximately US$0.10 per hour. This is based on a 97%+ cache hit rate and efficient token usage.
Q: Can I play offline?
A: Yes, the game includes a dedicated Offline Mode for locally hosted models. However, local models are noticeably slower and less capable than the recommended online model.
Q: Is there an APK version for Android?
A: The game is available for download on multiple platforms. Check the official website for the latest download options.
Q: What is NTR mode?
A: NTR (Netorare) mode is a gameplay setting that shapes the tone of the simulation. It allows for more dramatic relationship dynamics and betrayal scenarios. Vanilla mode offers a more traditional relationship experience.
Q: Can I influence the characters' decisions?
A: Yes, your messages become part of the same world the agents respond to. You can message characters, influence events, and interfere when something feels wrong. However, you cannot directly control their choices.
Q: Is the game suitable for minors?
A: No. This game is strictly for adults aged 18 or older. All characters and events are fictional.
Q: What happens if I run out of API credits?
A: The simulation will pause until you add more credits to your API account. Please set a monthly spending limit with your API provider to avoid unexpected charges.
Q: Will the game work on my device?
A: The game supports multiple platforms including macOS (unsigned build, manual approval required). Check the official website for system requirements and platform availability.
