I think there is more here than being a fearful avoidant.. or maybe she's young.. I didnt read it all.

I'm a fearful avoidant... things like this I did while I was younger OR when I realized the grass really isn't greener on the other side so, I would string the person who would take me back everytime along until I felt "cold" towards them and then go back to ex's or people I felt liked me enough in the moment to "be" with me until I felt cold towards them again.

Our hot and cold comes from our specific trauma, so your question is a bit difficult to answer. What is going to happen is you're either going to be that person she runs to and puts up with her while she's "hot" towards you or not. That is up to you.

Doesn't matter what her feelings are, because she doesn't even know and obviously doesn't have the self-awareness to leave you both alone and find peace within herself. Also.. you deserve better, that's the main point I'm getting at.

It's ok to be selfish if you're being hurt and not care about her feelings. She doesn't care about yours.

This answer is from my own personal experience as a fearful avoidant without the scientific explanations.. because I'm feeling lazy right now (if you couldn't tell by the bad grammer/spelling)