Is AUTHOR wrong in the post ? POST :  A few months ago I met one of my boyfriends friends at the gym we frequent (boyfriend, friend and I all go to the same gym). It was night (24h gym), so nobody else was around. We were training normally, but started talking a bit during the breaks. At some point we started talking about martial arts. He had been doing boxing for about five months and recently started mma, my bf used to do some karate a few years ago, but they do some casual training together at the gym now). The friend started constantly bragging about how strong he was and how he always wins against my bf. He also asked me to feel up his muscles... (I didn't). 

Now, I guess I am a bit protective of my bf and I felt like he was constantly trying to impress me, which I found suspicious, so I asked him to show me how good he was and we went into the ring.  What he didn't know is that I've been doing MMA for the past 9 years... He tried to go easy on me first, but obviously that didn't work out well. After his arrogant behaviour, I really started to enjoy hitting him and because he didn't give up or go down, we went on for a while. Let's just say he didn't look too nice after. I was a bit afraid to tell my bf that I had beat up his friend, but he didn't mind (looked more amused/happy tbh). Not sure if I should tell him about the bragging/feeling thing though. AITA for enjoying beating him up?