[JAGG]

Oh boy ! I won't sugar coat anything so here is my 2 cents worth. You said you couldn't believe this happened to you in the begining of your post, yet by the end you are entertaining the idea of maybe getting back with her. REALLY? She showed you who she is, why didn't you believe her the first time. You are what you do , plain and simple.
She has low self-esteem, she is insecure, abusive, clearly has a drinking problen that you don't seem to recognize, and she is unpredictable. Now what about that is so attractive to you ?
You need to tell her , not only NO BUT FUCK NO.
Why are you wasting your time giving this a moments thought. She has no respect for you and already bulldozed over many boundries. There are hundreds of awesome butches out there. Don't you deserve better?
Of course she wants you back, you already showed her you'll put up with her abuse. She is a needy coward, slam dunk her and choose better this time.