Aww. I'm sorry to hear this, hun.
I hate to be the broken record, but what everyone is saying in this thread is right. This screams abuse and what he did to you could arguably be compared to rape.
I'm not going to tell you what to do. I'm just going to reiterate what others have said--that abusers, often, appear to be 'textbook nice.' My father was a class-A alcoholic and abuser and would flip from one end to the other like a light switch. Though I ultimately left my family and got out of the situation, it wasn't a romantic relationship, so I'm not sure what to say.
I don't know if abusers can be cured. I know they can at least be 'tame,' to a degree, with notice and discipline, but 'cured' doesn't seem right.
I'm so sorry to hear this. Like everyone else has been saying, you deserve better. If I were you, I'd get a friend (or two, or three, however many you're comfortable with) and confront him about it. Definitely do not do it alone. If he's that violent to you about calling him out on the rough sex, how is he going to react when you tell him you won't stand for this?
Again, sorry. I wish you the best of luck and hope you come out of this ok.
- Blue