I'm married and made out with a coworker at a rock show..should I confess?

I went to a rock show this past weekend and before that, I had posted on our firm's bulletin board asking people if they'd been to the venue. Well, this young guy who works here who I helped book shows for his band in the past sent me an email telling me about the venue. He goes on to say he was going to go but he couldn't because his friend's band was playing that night, then later emails me to say that show was actually another day and he's probably go. I said great, i'll see you there. I was going alone because my husband doesn't care for this band particularly and had no interest in going when I mentioned it to him. Well, I'm there and I see him there. He's with two other friends. We chat and drink, drink and chat. Show is great, afterward party is still going strong. By this time, i'm feeling like a teenager again (i'm 34). He's tipsy as well and he starts confessing all this stuff about how he had this crush on me for a while but never said anything because I was married. And this and that and this and that. He's very attractive and I'd be lying if I said there wasn't a period when I was booking shows for him that I had a crush on him myself. Well, long story short, he walks me to the bathroom (he pretty much looks out for me the whole time because I was alone) and when I come out, he quickly pulls me to the back in another section of the bar and kisses me. I don't stop him and we make out heavy and hungrily for the next ten minutes or so. After, I feel horrified and I leave immediately. He emailed me the next day and says sorry. I tell him forget it and just don't bring it up again. But I can't stop thinking about that kiss and the guilt but it was only a kiss so should I mention it to my husband and completely turn his world upside down? I've never done this ever before.