Lost Innocence at Work

I've been working as a bartender for five years now, and I thought I had it all figured out. But lately, everything's changed. My marriage ended a few months back, and with the stress of it all, I found myself drawn to this guy who came in almost every night. He was charming, older than me by a decade or so, and there was something about him that made my heart race every time he walked through the door. We started talking more, just small talk at first. Then one evening, after last call, we ended up alone. I don't know what came over me; I guess I was feeling lonely and looking for a way out of it all. It didn't take long before things got heated. We were both adults, but the guilt is still weighing heavy on my mind. What if someone had walked in? What if word got back to him about his wife finding out? I'm not sure how I'll ever look at him again or even feel comfortable serving him now that it's happened. It feels like such a dark secret, one that might come back and bite me someday.