Tl;dr: She cheated on me, then tried to blame it all on me, she wants me back at all costs, 3 days later posts on social media how she's over me.

We were together for 6 months. She started to lose attraction to me or whatever, for unknown reason. I did everything I could to make her feel special and ask what's wrong like a 100 time a day. Later found out she made out with a Chad, so I broke up with her. She's been seding me texts all the time, how she wants me back, threathening to kill herself if I'm not hers anymore, and hysterically crying. I ignored it all because I was devastated. I later found out she's been sexting him and sending him nudes while she was ignoring me and showing him texts of her acting cold towards me. I found out from a mutual friend (a real bro) that she has also had sex with him, and made out a couple more times. I called her, she denied it. Later confessed everything. I broke up with her and cut all contact. She has been publishing depressive quotes for 3 days, then she posts how she's over me and better off without me. I was told that from mutual friend. She also told all her female friends that I was abussive, that I cheated on her and acted like a dictator. I don't want to see her ever again. And I lost all faith in realtionship. I can't believe she could do this to me. It's been 1 month since the breakup and I fell much better. What else can I do to make myself a better man? Sorry for the long post