There's a guy that I like but he's straight & has a girlfriend.I totally understand(I can still dream can't I) but when ever he catches me alone he asks me personal and sometimes sexual questions.I'm still in the closet,so I don't know how he knows I'm gay.once,he even asked me if I had a crush on him.[I've never told anyone]what should I do?

Umm... the personal questions is kind of sort of a guy thing for guys who are close friends... as for the crush thing he might be having a inferiority complex or perhaps he's bi. Its kind of hard to tell sometimes. As for a course of action I have no idea what you should do I would have to say take it slow and continue life as it goes on and wait for him to break the ice. Hope it helps