I turned into a jerk after a breakup?

I'm not happy being meaner and less sincere and careless but I think it's still helping me cope. It's been like 3 months since the breakup and I am totally being a jerk but only mostly towards guys With most girls I'm just flirty or the same. Before and during the relationship I know (and have been told by friends, even a friend I usually just text) I was sweet and caring, more relaxed...Now I'm a jerk and more cynical towards women and relationships. I took this breakup hard, I don't care about it anymore, but I do not want to be so mean.