Cheating

Okay so long story made short….

My husband had an affair with my best friend for about 2 months pretty serious and than probably 5 or 6 where they’d talk about and she’d send him nudes and try to convince him to sleep with her…. They did a few times when I would like run home because we forgot something. Well I confronted them she denied it saying that it never happened when I’ve seen all their text with her literal nudes in them. He tried to lie in fear of losing me and we’re still working to see what happens and she basically is like stalking us….. sits outside of our house all hours of the night had followed me from our home to different locations numerous times and this was all like end of last year beginning of this year. The stalking has continues from may…. He hasn’t had contact with her since I returned home after telling him I wanted a divorce. He’s since made it up to me and had been 100% better about how he treats me. Says he regrets it and never should’ve let it happen and that he only wants me. But she still denies it ever happened I have no contact with her as well but she’s literally telling everybody and their mother that I’m psycho and I’m crazy. Should I have just never got back with him? Like why is she so burnt that he doesn’t want her??