Was I in the Right here????

[EARTHQUAKE2689]

Ok last night I am driving around with my GF after going out to eat. I stop to get gas and there are these two guys sitting in front of the store and my girlfriend says she wants to get out to stretch, so she does, and the two guys start making comments. I get pissed but she tells me to ignore them so I do. Then we both walk in the gas station and as we are coming out they keep talking so I say "shut your mouth or I will shut it for you!" and the older guy (probably 23,24 years old the other guy looks like he is my age) he takes this as an invitation to grab her by the hand she stumbles and falls and scrapes her knee so I get even more pissed and I punch the guy twice and he falls and I hit him again and the owner calls the cops and I have to get my brother to come down and we sort the whole thing out. The cop ends up saying it was self-defense but now my bro is pissed at me I just want to know do you guys think I did the right thing or not?