Agreed. Do not break up with him. He is hitting you because you want him to, and he is probably doing it fairly gently, because he does not want to be doing it and is doing it out of love because you want him to. He does not seem to get any satisfaction from the act of hitting, per your report. So, hopefully, he is as careful as he can be while stilling fulfilling your wishes.

If you leave him and end up with a guy who will actually ENJOY hitting you, you will be far worse off. You will be in physical danger much more than you are now, and, the situation will be far less treatable via therapy, because there would be a complex dynamic involving a guy who ENJOYS hitting you. Right now, you have a pure case: you enjoy being hit, you have a boyfriend who goes along with your wishes against his wishes, and you will engage a therapist to help with this fairly straightforward situation. MUCH BETTER!