Did a married guy just flirt with me?

I was at the gym today and took a class which I rarely do. the instructor had us get into small groups. There was one really attractive guy in my group, so we started chatting. We chatted throughout the class and again after for about 15 minutes. As I was leaving, he was leaving at the same time and had another 10 minute conversation. He was friendly, but I don't know what to make of it. he was really attractive, and hope to see him again. I'm not sure what to make of it. I saw he had a ring, but couldn't tell if he's gay and flirty or straight and just friendly. What should I do if I see him again?