Most Helpful Guy
If you push anyone to their breaking point, they will push back. Now that he knows his limit and where rock bottom is, he may have more control from now on and never hit you again, but who knows? There is no right or wrong answer here. I think it is ok for couples to work out their problems and become stronger as a result of it, so this could be a good thing to look forward too. If you want to break up, most people will respect that too.
Most Helpful Girl
If I was in your situation I would break up with him. This is the same way all abusive relationships start out the guy loses his temper and hits the girl. The girl forgives him and doesn't leave him because she's attached emotionally and she believes that he's not that type of guy only to later find out he is and had just encouraged is violent behavior by saying I will always forgive you no matter how bad you are to me. These guys pick girls that are easy to manipulate and manipulate them by putting on a Jekyll and Hyde personality when they're good they're really good they'll buy you gifts and take you out like a prize. Then when they're bad they're so bad it's like the fantasy world you knew was ripped from under you and your just waiting for it to be good again and eventually it is, but not forever it's a constant cycle. If he hit you once he can hit you again a guy that cannot control his temper is a dangerous one.