To be completely honest you shouldn't feel too guilty, you didn't initiate the kiss... she did. Knowing that she is in a relationship,albeit an abusive one, she shouldn't have kissed you. Since it'd end up making you feel bad she should have taken that into account. I've been in so many bad relationships I've lost count, some are easy to get out of,some aren't...
Depending on certain factors there is a chance she can get out of it unharmed,well.. more or less considering what he has already done..
But at the same time it might be tricky pursuing a relationship with her afterwards. As stupid as it sounds, most women end up going back to the ones who harmed them. Usually after the person promises they have changed, won't do it again.. yada yada. I've done it, my mother did it with my father...
I just pray it doesn't happen to my little girl..
But back on topic..
You shouldn't feel horrible because of something you did not start. You have feelings for her so of course your body would react no matter what your mind tells it to do. Been in that situation before, not a fun one but it happens.
Sorry if I'm not really being all that helpful..
