"Best friend" problems.

She is PISSED OFF because I REFUSE to go stay the night or hang out with her at her house while her brother is there.. He is a 43 year old meth addict who has drug induced psychosis. Today while I was over there, he came out in the room and started calling me a whore and a dirty slut and that I'm all these things which is why the father of my child left me, he even got in my face (Im 19 and 5'3.. Hes a 6'5 and over 220lbs)... Let me just say, I am VERY short tempered and if I was not pregnant, boy oh boy... I am one implusive person so there is no telling what I would've done.. He even got into her one year old nephew's face and said he was going to die.. Their mother makes up so many excuses for his behavior and doesn't accept that he's a drug addict.... Ive been dealing with his behavior that as gotten increasingly worse for the pass several months and I just cannot do it anymore.. I am 8 months pregnant and being in that house makes me extremely uncomfortable.. I dont even go to the bathroom at night when I am there... So I told her today that for as long as he is there, I will not be going over but told her she is more than welcomed to come over to my house and hang out.. Now she's pissed off me, calling me a bad friend.. LOL. I just had to vent.