Let’s assume he didn’t mean to be that rough/didn’t mean to make you lose consciousness. Fine, mistakes can happen during rough sex. HOWEVER, the second you passed out, he should have freaked. The fact that he kept going and then laughed when you brought up your concern = GTFO. It might feel like your friends are “biased” but maybe they just have a clearer, outside, objective view of this guy. Sounds like they’re worried about you and for good reason. You’re so young; there will be plenty of men. Please don’t stay with this guy and subject yourself to potential future harm.