How to move past my ex, When he hurt me so badly?

A few months ago my bf broke up with me mostly bc we had been arguing a lot and just not getting along. Our relationship was far from perfect. He wasn't over his ex and would get mad at me, when I simply asked who he would be talking to and it was her. I still believe he only asked me out for . Now, trust me I have very little feelings left for my ex, but I still can't get over how much he hurt me. Not only breaking up with me, but being cold and not caring about me and bluntly telling me, then flirting with my friends right in front of me and just being a . I'm above revenge, it's not my style, but how can I move past the hurt he's caused me? It's had to forgive him, specially when he's not even sorry.