Why do ex girlfriends become so mean and hate you?

foundry
I was wondering why so many times do ex girlfriends become so mean and hate you after a break up? In my situation our relationship was 2 years and we both were very loving and she gave her V to me,but after the break up she asked to me friends but I said I was not ready yet and needed time.since then she's been cold and distant and ignores me,I never see her,she spreads stories about me to other new girls I'm flirting with and messing up my friendship with others.so why do girls do that in general after a break up?I do still kind of love her and its been 3 weeks on no contact now
Why do ex girlfriends become so mean and hate you?
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