He might like you, but he does have a girlfriend. I suggest you not go out with him until you are sure he is single. It can save you unneeded problems with his girl. If you talk to him again, let him know that you don't want to get in his business, but he has a girl, and should not be talking to you. (How would you feel if your boyfriend were talking to another girl?)
Let him respect you that way. And if he does have problems with his girl, it's going to end between them, then you can go on a date with him.
Hope this helps.
