Need advice to accept ex

Hello everyone, Greetings. I am in a long distance relationship with my girlfriend for more than 3 years. We are happy till now. I already know that she suffers from OCD. Recently she confessed that she shared her bed with more or less 5-6 guys including my friends in the last 2 years. She is also in a serious relationship with one guy. But she is in dilemma whom to choose. I understand that she is suffering from sexual OCD in which people get sexual attraction to friends, less known people etc. Now, she wants to continue my relationship after realizing her mistakes. She says that she will undergo treatments to control OCD thoughts. My problem is that I am willing to accept her on one side but on the other side, I am still afraid that she might relapse again in to these thoughts. Can anyone let me know how you would react in this situation? Please advice me. Thanks in advance.

Have fun with the sex but forget having a relationship with this one, she will never change and it will only hurt you. I am a women and have seen this before, she is coming back to you because you are there not because of love. end of story, I would not waist any more time if you care about yourself.