Hmmm, the simple matter is he fancies you and he must have seen you talking to other guys and got real jealous. Be wary of this guy as he will be very controlling and will like to try to 'embarass' you when others are around. He is obviously very insecure and doesnt have any experience with women. When he found out you liked him, he must have got all excited and was hoping it was gonna be a full blown romance. I guess you must like him too, but maybe in a friendship, sort of way. The only thing you can do is ask him, but only when your on your own with him...