Why does a person turn like this?

I have been dating a girl named Nichole silva for over a year now, and she has turned into a completely different person thn she was when I met her. And the fact is that I have no clue why. She's become a monster, and one I wonder whether I can continue qnwew23222tolerating. I think she might be mentally ill. Maybe it's drugs. Maybe it's someone else. Whatever it is, she is a totally different person. Abusive. And the fact is that I know it because I have seen it before. Perhaps this is karma for abusive relationshiops I have ebbeen in in the past. I wish I knew. Nevertheless, what I *do* know is that I have a limit and it's nearly reached.