I won't be what you expect and say simply that you need to get out. I won't lie and say whether I know if he can or can't change.

Fact: Right now, you and most everyone here probably agree that you can't be in a relationship that is with an abusive male.

Fact: Some people change, some people don't.

But if say he is one that can and would change, there needs to be the motivation for him to do so and you need to be in a place to see the change, where all the while you remain safe. That's why for now you do need to get out, with the thoughts of permanently breaking it off being the idea. The ONLY thing that will prove or disprove that he can change and would do this for the relationship will be when he actually sees you leave. Dont' say "if...you change" that leaves it too open. If he wants you in his life bad enough, your leaving without any caveats will convince him he has to. I wish many difficult relationships in the beginning forced themselves to go through this. It will be a test of his muster and his commitment to you. If he does nothing you won't lose anything and you'll probably save yourself from a lifetime of pain, and possibly literally save your life. If he changes, you will know.

I can only guarantee if you don't leave, he will continue the pattern, period and the longer you keep staying with someone prone to abuse the more often and more likely he will abuse you because they no longer have anything to lose.