What should I do? I'm being traumatized.

My mother has a "boyfriend" that has a girlfriend. Yes, he's a cheating bastard. My mother and I share a room together. We have a spare matrice and the room is big enough to fit two beds. Her "boyfriend" sleeps over 3 days a week. In the beginning, she would make him sleep on the matrice on the floor but that only happened twice. I guess he told her something about it because now she wakes me out of my sleep and tells me to go sleep on the floor. It doesn't matter how deeply I'm sleeping. I have a baby nephew. She also makes him sleep on the floor next to me. I'm 17, my nephew is 2 years old. Starting last week, I would wake up to the sounds of my mother and the man having sex. Loudly. Everytime he slept over. It happened again an hour ago. I'm currently crying. How could she do that? I respected her so much. Am I not deserving of respect in return? There are countless other places in the house to do it. Not to mention, the fact that she's even doing it with HIM. He raises his voice at me and curses me regularly. "Fuck, Fuck, Fucking. " Always. He even asks me disgusting questions. Right in front of my mother. Asking me if I've ever had sex, if I've ever given head. Yesterday, my mother insisted on picking me up from a date with my boyfriend. The man was in the front seat. He persistently asked my boyfriend about our "sexual activity", of which we haven't had any. " Did you cum in the mouth?" "Do you like raw dogging it? " and much, much more. He's so disgusting. What should I do? I'm thinking to simply sleep outside from now on. I do not want to so much as even touch that bed.