Friends after breakup?

I broke up with my girlfriend 3 months ago, I was told every time we were together that I was a bad boyfriend and she would actually rather talk to other boys but I loved her and tried to do my best. In the end I startet hating myself and talked to a friend, and she talked me into breaking up with her after we had tried talking about it. After I wanted to become her friend but every time I try to be nice and tell her good things about her og such things she answers with a text meant to irritate me of hurt me, and if I answer back she tells me now she hates me even more but won’t unfriend more or anything becouse she thinks a friendship in the future would be possible. I have now been hoping for this friendship for 3 months, she slept at my friends home alone and cuddle with one other of my friends, we are in the same friend group and then she said she doesent want to be my friend if I get mad about things like that. And I just really love every second with her, but can’t seem to not ruin it. Maybe I’m writing too long will stop here.