We are a friend group of 5 girls in our late 20s. My friend Cassie had a relationship for 1 year and something more with a guy (this was 4 years ago). It was an toxic relationship mostly emotional abuse to her, he was very jealous and controlling but it never got physical. They had extreme fights and even though they decided to live together it did not work out. He left her after a big fight. He talked to me first some days after the break up, accepted all of his toxic behavior and said to me that he had been seeing a therapist (for 1-2 months before they broke up) and he realised that his behavior is abusive and that he needs to fix himself and being with her makes things worse for him. She still loved him but did not actively try to get back with him then. (I say for the better). After this he continued to go to therapy I dont really know if he fixed things inside him that led him to that behavior but he surely made a lot of steps towards being a better person. Since the break up and after 2-3 months of talking on the phone and a meet up with her (like closure thing) he never contacted again. He never did anything threatening to her or bother her at all. All good up to here?
She on the other hand is OBSESSED. She talks about the relationship all the time and tries to find excuses to blame him that he poses a threat to her. She says that he is looking at her all the time (he has a new gf for a year now) but he is not. She has gotten paranoid she thinks she hears his friends talk about her when she is around (we live in a small city so we see each other a lot) which is really not happening. Everytime she goes on a date with a new guy she says that the new guy is acting weirdly around her because her ex has told bad stuf about her to everybody, which I know ahe has not. Every rejection she had in her love life since, is because her ex goes to her potential lovers and warns them about her and stuff. These things DO NOT HAPPEN. She connects everything with him. She started going to the gym a couple of months ago and she found out her ex is going there too, and even though he goes there different classes and hours and they dont meet and he went there before her, she insists he did it to spy on her. She sees cars following her and says it is his friend that he sent to spy on her. Like for what? It pure paranoia. She cannot talk for anything else than him. She has been going to a therapist 2 years now but the therapist seems really bad since she has not been helped at all. On the contrary its getting worse. I cannot even remember every crazy thing I have heard the last years. We are all tired. We cannot go out and talk about anything its always going to be about the ex in the end. We have talked about it we supported we understand the trauma she has from the abuse but she needs to move on. She is losing most of her social circle and I am very sad about it. I have told her all this but she refuses to believe me. What do I do? She had relationships with other guys (one was 4 years and more serious than this one) but this never happened! I dont know what to do!