I don't know if it helps to realize a lot of people have gone thought similar things like the people who posted here, and I have too. 

It's extremely painful and thinking about it is all consuming.  It feels like you will never get over it, but it is like any grieving process, and it gets better over time.

Just remember that she has to carry her behavior with her throughout her life and will undoubtedly mess up future relationships, but you can move on and let it go and realize it's not your problem, and all you can control is how you behave.