I still don't like the situation. However, I can't be a hypocrite and tell you that you need to forget all emotion involved and leave. I won't tell you that because, while it wasn't a boyfriend, I was routinely abused only a couple years ago. It took so much to get me to leave the situation. It took a couple years of someone convincing me to get out of there. I did eventually, and I'm happier now with my fiance. What I'm trying to say, is that I understand it's complicated. You love them, how can you live without them and you don't want to hurt them. But if they really care about you, they'll get better with their own **** and not abuse you.
I guess I understand why you wouldn't want to live with your mom. Is there a friend you could stay with for a couple weeks maybe, if only to relieve yourself of the tension in that house for a little while? It might help you clear your head.