Run, don't walk. Don't look back.
None of what she is doing is in any way your fault. None of it, in fact, has anything to do with you.
The only reason I'd even think about it again would be if you see a pattern in terms of what kind of relationships you find yourself in. Then, it might be worth looking at why. But if this is an anomolie (sp?) just get out of the way and let her own little hurricane pass you by.
Good luck. Stay strong.