SA’d by ex, dk if i shld expose him

When i started dating this dude, we went for a movie, like 1 month in, and after the movie we took the stairs to exit. While going downstairs, he stopped me, started kissing me. We were making out and out of nowhere he grabbed me…i was fine with touching my boobs but this was something that took me aback. I pushed him away immediately and told him that i was uncomfortable with it because i had been sa’d as a kid by a friend. He consoled me, started apologising. Then we went home Cut to, the next month.. i was staying at an airbnb for my exams (so id be close to clg), i called him over to study and because i felt very alone at the place. I told him we would strictly study but i knew we would also be making out. He comes over, we start making out and he starts pulling up my shirt to which i say no. He insists, i keep on saying no. He asks why, i tell him I’m uncomfortable. He still insists and tries to pull up my shirt. At this point I’m pulling down my shirt in order to sort of fight him. But eventually i give in because he wouldn’t stop. Now he’s my upper body which is naked. A few days later i book another airbnb for the rest of the exams. I call him over, still unaware that i had been SA’d previously. Again, had zero intentions of sex or being naked. He starts insisting and asking why again and the next thing ik, I’m fully naked. I tell my sister about this. She tells me to breakup and that he SA’d me. Mind you, i had said “No” more than 5 times. I break up with him, then because i can’t stay away from him, i go back to him. I do this 2-3 times breakup, patch up. And after one of the breakups, i start finding some other guy cute, i tell him. He says i microcheated on him by following the new guy on Instagram. Massive gaslighting leads me to feel so bad and i get back with him after apologising for a shit ton of times. 2-3 months later, i start to replay all the horrible moments in my head and realise that i shouldn’t be with him so i break up for the last time. He ends the conversation by comparing SA with “microcheating” (following a guy on IG). It enrages me, so i ask our mutual friend(his best friend) if he’d be friends with someone who SA’d one of his friends. He knew i was talking about my ex(his best friend). He said he wouldnt break their friendship; he will make him apologise to me and said “if he does that to someone else then it’s a problem”. I feel so hurt at the fact that he thinks it’s not so wrong that it happened to me because he was my good friend. Now I’m not talking to my ex and his bestf and i get to know that my ex talks shit about me. I want to expose him so bad. He talks trash about me but won’t tell people what he did. I don’t want people to think that i was the wrong one. I want to tell everyone that he’s a sick mf. Idk what to do, i feel helpless and so anxious every time i see his ass.