Does he not like me anymore?

i like this guy, and im almost sure he likes me too...or is it used to like me? anyway, he used to be super flirty, and he still is most of the time but he doesnt talk to me as often since we started the new trimester and dont see each other during the day. he used to do stupid things and call me by a pet name, but today he looked over at me and just smiled and didnt talk to me for the rest of the time. the last time he flirted with me was last thursday when we were hanging out just me and him and his friend after school he kept pushing my hat over my face. and when i opened a locked door for him he said "thank you (pet name) in a weird voice. i didnt see him friday or over the weekend or on monday. does he not like me anymore? am i just overreacting? do you think he has ever liked me? why wont he ask me out?