Should I tell him?

My bf and I were going through a rough patch, he was not treating me well and I was ready to break up. I made a very stupid mistake, I got drunk at a club and began grinding on a friend who later touched my breasts. Nothing further was going to happen, I was purely intoxicated and heartbroken at the moment. My boyfriend and I ended up working things out, and we are willing to grow as a couple, things are perfect now. However, I didn’t tell him what happened. I know that it would ruin everything, even if it meant nothing in the end. Is it worth it to tell him and very much potentially ruin our relationship?