Ok so I like this one guy and I don't know if he likes me back it confuses me because hw is a very confident dude but one day he will ealk by me in the hall way and nervously smile and say hi and act nervous around me all day then the next day he will be all jumpy joke around with me say hi A LOT and look at me sometimes then the next day he will just not say anything all day around me I'm so confused what's going on?

It sounds like you are looking way too much into it. Just see what happens.

I think you both are teens, and he is acting normally!
He probably isn't interested in you, more than just saying "hi". If he were, he would talk with you, and stop playing around. As another answer said, I think you are looking too hard at this. Let it be. Good luck.