My boyfriend assaulted me and my mom said it’s “normal”

I (19F) and my boyfriend (19F) had a sleepover at my house. I still live with my parents and he asked to have sex, I said no because I obviously didn’t want them hearing.

Later in the night I wake up to him touching my crotch through my underwear, and he used my hand to get himself off, I don’t know how long it was happening for. I froze because what the hell are you even gonna do in that situation. I talked to him the next morning about it, and he said “sorry” like he usually does. But here’s the thing; if I hadn’t told him I woke up, he wouldn’t have told me what he’d done.

This was a couple months ago and I told my mom I wanted to break up with him, but she seemed mad.??

Skip to yesterday, I finally had the courage to tell her what he did, and she says “oh that’s normal, guys just wanna do stuff”

LIKE WHAT?!? Who says that? I’m so pissed and confused. I feel trapped and I’m still with him even though I don’t really like him sleeping over anymore and I don’t feel comfortable and in love with him anymore. I feel betrayed and frustrated. I don’t know how many times he had done it before or if he recently did, and I have no one to talk to about this.

Thanks for reading and letting me get this off my chest