When My Secret Got Out at Work

So I'm this barista who's been with my girlfriend, Sarah, for about five years now. We're both pretty open and honest, but obviously there are things we keep private from work. So naturally, I never mentioned anything to anyone here. Thing is, one day I come in late because my morning routine was... let's say a little more exciting than usual with Sarah last night. So she gave me some major bruises while we were at it. Of course, I covered them up as best as I could but one of the regulars, Mike, who knows how to spot things, noticed and didn't hesitate to ask what happened. I was just trying to play it off like a clumsy morning, you know? But he's this guy with these eagle eyes, always probing into people's lives. He started asking all sorts of prying questions about my personal life I wasn’t ready for anyone at work to know about. Told him everything - how Sarah and I have been together since we were 18+, and now after so many years, she still gets me going more than ever. And then he just laughed it off like 'Oh really? Got any tips?' It was super awkward because everyone else at the counter heard. And then the next day he comes in with a whole story about how his wife is into roleplay and stuff - I guess to make me feel less weird, but it only made things more complicated. So now I’m just waiting for someone else to find out, or to have Sarah come in one day and everyone knows we’re together. It’s like this huge looming cloud hanging over my head at work now that my private life isn’t so private anymore.