ever since I moved in with a couple of friends things have been getting kind bad. One of them has been abusing his soon to be fiancee, both mentally and physically. He has hit her, and on top of that she is pregnant. I talked to his exgf last night (my sister) and I found out he did something as crazy as shove a sword through the bathroom door to try to stab her. and i know as soon as I move out it will get way worse with Mary, she is blinded through love and loyalty, and I know he will use that. last week we all went out to eat, it was myself and a few friends plus both Mary and Parker, well they got into it, and he ended up slapping her across the face. I know as soon as that baby is born it will only get worse, I have seen and heard about too many guys like him.. What do any of you think I should do?