Can I be arrested for defending myself after I was attacked?

Ran into a childhood friend at a bar over the weekend and had a pretty lengthy conversation with her. Gave her a big hug when I saw her because we haven't seen each other in about fifteen years or so. Her boyfriend got extremely jealous and defensive and hit me on the back of my head/neck while I was not looking, so I hit him several times in the face. Both got kicked out, officer was called, and the guy claimed that I was trying to get with his girl and that he asked me to leave him and her alone, which never happened. How many people do I need as a witness that I was attacked?