What does it mean when a guy says this? Please help!!!?

So I was on Facebook messenger and I noticed that someone messaged me. When I got on the app I noticed that it was the boy that I used to talk to in high school. We used to go out but it didn't last long and he was playing games a little bit so I stopped talking to him for a while. So when I was texting him, I asked him "so how's you and your girl doing" because he had a girl the last time I talked to him. Then he said "I'm single" then I said "I thought you had a girl...guess not" he said "that was back then and no im single" then he asked me why I asked him that and I said "I was just asking smh" then he did "don't do that lol smh.... You still wanna be together or something?" What does this mean??