Would you be offended?

A guy i like and he admits he likes me too but he is somewhat scared of talking to me in school. He never starts a conversation there and if we do talk it's just small talk and act like we weren't just on a date the day before but he always hangs out with this one girl in one the classes and talks so much and mucks around with her. Not sure if I'm just jealous or offended or even both at the same time?