Confused

Syndol

There is a boy in one of my classes and we pick on each other a lot. You know we jokingly say we hate each other but every now and then he'll wink at me and give me a little smirk/smile then look away or walk away. He did it today too, i was dressed sorta as the joker for school spirit and he sorta made fun of me but he winked at me more than once. What does this mean? Am i overreacting? Help