I am left broken by her. What should i do?

I'm on the other end of the spectrum. I wasn't quite as extreme as this girl seems. In fact, she sounds like she has a few screws loose. However, you don't need to take all this on your shoulders. Also, your family has no right putting that kind of pressure on you. We are all young and we all make mistakes. If you truly love her then give her time to grow whether you get back together or not. I had to take 3 steps back and realize my behavior was childish and unacceptable. If I was given another opportunity I would never waste it the way she did lol. It's not something that she can just turn off though. It's a constant struggle until one day you change and things come natural.