Does he like me? What do I do?

I have known this guy for a couple of years, but we went to different high schools. We never dated, we just talked and hung out periodically. When prom came around he asked me if he could accompany me to my prom. We went to prom and he was very romantic. After prom, we went back to my house and his mom kept calling him to come home, which was odd for her as he has stayed over before…

I just found out that he has been in a relationship for a year! So when we went to prom they had been together for 6 months. I know his family on a personal level and no one ever said anything about his girlfriend or even posted a picture of them on social media! Now we go to the same college and whenever he sees me he always comes over to talk to me. What do I do?
Does he like me? What do I do?
Post Opinion