I love you the most

Once I had a one night stand with someone who knew my boyfriend, who wasn't his friend. We were both out drinking, and one thing ended up leading to another in a night of drunken debauchery. I feel guilty, but will never tell my boyfriend as I've never done this before in my life, nor do I ever plan on it again. At the time we had only been in a relationship for 3 months, and we've now been together for 2 years. If anything, this has made me love him more, the second after this one night stand happened. I feel as though I'm a horrible person, but ironicly I've become a better girlfriend because of this. Sometimes I wonder if I should tell him, to be truthful, especially since prior to it I had been tempted before, but never did anything. I still love him more than anyone, and would never hurt him again, and haven't, as opportunities have risen which I've completely rejected. Would you tell him, if you were me, and it was so long ago?
Category Betrayal