You mentioned in one of the situations that he was asking you questions he obviously knows the answers too. Its a typical technique guys use. A guy will ask a girl questions that he knows answers just to get her to respond. It sounds silly, but it definitely shows he interested.
I'm curious to know how interested are you? And don't think about it. If anything, you're brain will confuse you and your feelings. Go with your gut. Don't read too much into the situation. Live it out and see where it leads.
