Should I tell my boyfriend or not?

Okay, usually when guys are abusive, they will apologize and we forgive them and they say they won't do it again. Then it happens again, and the same thing happens. Once they abuse you, they will do it again. For the other thing, you should tell him the truth, if you want your relationship to stay honest with each other, you need to tell him everything, and same goes for him. I told my ex boyfriend about what I did with one of my guy friends, and after the first couple of days he was fine with it because we were single, we were not together. Just be careful!