Cheating...

So I went to a playoff basketball game tonight and I saw my friend I haven't seen in forever while I was in the parking lot (I have a boyfriend heads up) and I talk to my friend for awhile and we hug and I walk away and he grabs me and kisses me. I didn't know what to do. But I just told my boyfriend and he freaked out. I've never cheated nor plan on it but this is making me feelin awful an I just don't know what to do. At least I told my boyfriend instead of hiding it. Right?