Was I assaulted or was it just sex

I was having sex with a guy yesturday and he started getting really rough. I told him to slow down and he kept going.. I told him to wait and he kept going harder. I'm assuming I blanked out afterwards, cause when I opened my eyes he flipped me over and said "let me cum please" and he kept going. For some reason, I couldn't move. Today I'm in alot of pain. Is this wrong? is it my fault?