P frog is right, I am afraid. I have been on both sides of the abuser/abused spectrum. Once the boundary is broken and he has laid his hands on you in anger, it will just get easier and easier for him to do it again. What your experiencing is 'escalation'.
His behaviour started with verbal abuse, and now he has become physical, this will eventually become worse, and he will end up hurting you.
You do him no favours by allowing this behaviour to continue, he will not correct his behaviour whilst you are with him. I am not saying it can never work, but for now you need to get away, and tell him he needs help if there is to be any hope for the future.
Then you need to stay away until he has completed or is well into his programme.
After that you start from the beginning again. Dating and restoring old boundries that he crossed before.
However some abusers just cannot be around people they have abused because they feel draw to the same old cycle. Maybe you could look into, what makes you think this is a relationship worth keeping, and what you get from it, and what hope you see for your future, with/without your partner.
First things first though you must get away, do it quietly and without confrontation. And wait til you are out of there, before explaining to him what your doing.

Before you think you can fix him, you can't , once he starts abusing you and you put up with it, you become part of the cycle. He has to fix himself.

I wish you all the best, and hope that you manage to work this out one way or another. Take care.