Ouch, dude, I feel for you.

I hate to say it, but she seems rather unstable. In the same way that a unicycle balancing on a tightrope over the San Andreas fault is unstable. Ya dig?

I would really ask yourself if it would be worth it to fight for her. This is still the same chick who hurt you before, she hasn't changed, she's just bored again.

I would back off. Just take some time for yourself. Force her to handle this herself. Don't allow yourself to be jerked around any longer, you don't deserve it.

Be strong brother.

Peace.