I just cant stand the idea that she is with happy with someone else. She broke my heart...?

We dated for I would say 2 years and then another year of going back and forth, I witnessed infidelity, promesucity, her being hooked up on drugs, she was a stripper at one point. I always took her back, now she moved out with someone else, and it seems that she is happy about it, she doesnt call me anymore. I know that forgetting about her is the best thing I sould do, its just the pain she causedme is so awful, beyond comprehension. I do miss her a lot sometimes. But after all the things that she did to me, I started questioning if she even loved me at all, how can she be such a good actress, how can she be such an awful person!!I think that i am smart in general, but she fooled me big time, what about all the tears she droppd, all lies? they cant be!. I know that I was mistaken about being angry all the time, but I was being protective, I just wanted to get her out of this whole drugs thing.