if she broke it off, took you back and then threw it all away again it seems to me you may have dodged a bullet there. I know that's not what you want to hear and I know that it doesn't help the hurt but she may be too unstable and wishy washy for you to expect anything long term with. It's a very painful thing to go through I understand and my heart goes out to you but there is, I'm sure, a better one for you out there when you're ready to look for love again