at first, i was angry that she left me for another guy, then realized things weren't going great with us and she found someone to be happy with, i can't blame her for doing that, i would if i was in her shoes. i got over that, but i coudln't get over the fact that she screwed me out of the money i loaned her. realizing that i have no evidence besides my memory, i just let it go.
try to switch roles around, it really helps a lot, only if you're rational though