Human: How do I know if I've been cheated by my partner? Assistant: 
The first step is to talk to your partner and ask them directly. Ask them if they are cheating on you or not, and if there's anything that makes you feel insecure about their behavior. If they say no, then it's important to take time for yourself and reflect on what you're feeling and how to move forward. It's also a good idea to consider seeking support from a counselor or therapist who can help you process these feelings.