Does he like me really?! Help!?

im in middle school and we have two classes together. we sit next to each other in one, and we always look at each other in the other. Then we sit next to each other on the bus. He's always teasing me and lightly punching and stuff like that (it's playfull tho) & he always teases me about liking him. every time i say no tho. but i do. And i want to no if he likes me? Also he takes my pens and pencils etc.