I told my boyfriend I kissed another guy.

last week I told my boyfriend that I had kissed another guy a month ago when I went out drinking with my sister and a couple other girls. he went out for a cigarette and then said it was fine, he didn't want to talk about it. everything has been normal all week, he tells me he loves me every second he gets, he always wants to cuddle with me. last night we were drinking and I told him that I bet I would get yelled at that night because he hadn't yet, and he said no way, he wouldn't yell at me, he loves me too much, and he doesn't care. I don't have a clean record either. I had messed around drunk before and my boyfriend had to take a few months away from me. I know he loves me with all his heart, and I'm the same towards him, but how is it this doesn't affect him at all? I think I would be incredibly hurt.