Toxic friend and moving on

So I had this friend whom was always kind and thoughtful however she hooked me up woth a fiend of hers who liked me and we started dating and it went well until I figured out the disrespectful jokes he said about me behind my back and how he would take out his anger on my friends by "play fighthing" even though they were genuinely jot ok with it and hated it

I broke it off and asked her to stay way from him since I knew how dangerous he could be if he got to ascertain point mentally and ik I sound dum staying with him fir as long as I did knowing what kind of person he was and I honestly have no excuse

Anyway she said she would stay away but after week tried to convince me that how he acted was alright becuase it was all for laughs and it made me so mad knowing what he said he would do to my friends after conforting him and when I told her how I felt she ignored me and continued to put her arms around him and stuff

what bothers me nowis how she always has to come up to me and be near me where I go it makes me uncomfortable and ik she does it to see if ill look at her and she puts me in situations where I have to talk to her or I look like an asshole so idk what to do I dont want to become someone who's resentful and doesn't move on but on the other I dont think i can just forgive and forget I can't forgive her and I want to forget it but its hard when she basically testing me to see how far she can go bothering me

I just need some advice anything helps