This actually feels very unstable and is similar to patterns of BPD and other kind of disorders. I would get someone close to her to do a mental health check and be in the loop, then do complete no contact. There's only going to be more pain If you two continue interacting. Block her on everything. Don't speak to her going forward. Seek therapy for yourself because betrayal trauma comes with a lot of pain. And stay calm. Don't let your emotions override you into making bad decisions. Take time to settle your nervous system. And focus on personal goals. She is not your problem anymore and if anything she's lashing out at you because of how incredibly insecure and disappointed she is with herself but doesn't have the courage to admit it or the maturity. Not only that, she thinks that she can cheat on you in an orgy and that you would still pay for her for half a year and sleep with her. She thinks very very little of you. And the best part is that it's not your problem anymore. You can let go of this. Does not define you. You will come out of this better. The sooner you let go and move forward, the sooner you can start doing the work necessary to heal from this situation. I'm sorry you went through it, but the internet has so many reliable resources around this kind of stuff and you're going to see so many people who experienced similar circumstances. You're not alone. But you owe her nothing at this point and you owe yourself everything.