am I wrong?

My boyfriends mom is defenitly a piece of work (idk how else to say it). Me and him have been together for 8 months and during that she has been so drunk/slung out on drugs that she has accused me of sleepin with her husband, attempting to fight me, I'm only usin her son, and etc. I've given her chance after chance but the last time she did it, she had told him she doesn't want me around anymore and doesn't want me in any of their lives. Well, today she said she wants me around just for my help but I don't wanna help her. I've lost all my respect that I had for her and the only time she wants to be nice now is when she wants/needs something and then she's just fakin it and its obvious. But anyway, am I in the wrong for not wanting to be around we or help her throw stuff away?