I just got into a fight and lost...O.o?

Errrr Last night I got incredibly intoxicated with a friend of mine from work, I'm his boss :(. I've been a little on edge with him recently because he really likes to screw me over financially. I've lent him large sums of money. We've also had a small...fling. I've gone out of my way to help him at work and have never recieved anything in return. In the state I was in I decided it was a good idea to confront him about this (!?) and we got into a "I talk better **** than you" argument basically lol. End result, I end up getting punched in the face a lot on his bed and leave. I was so enraged I decided I wasn't done, after going home and calling one of my friends I decided it was a good idea to key his car (WHY!? AAAAAA!) So now, the next morning I am facing what I have just done...I have a black eye and must work tonight (not with him thank god). I want to show him I'm not a push over so he wont continue to take advantage of me...but also want to be able to show my face.