Most Helpful Guy
HEY REPLY TO THIS. I'm in the exact situation and I'm the guy. It's like you're describing me word for word... It's true about the break and stuff. It's also, because the girl also doesn't look and I sometimes feel that she has no feelings for me. I'm outgoing and talkative around my friends and for some reason more revealing to strangers than acquaintances because I'm scared they know my past(did some stuff that most people know. not that big. it just shocked them all.) Say hi to him first couple of times. He'll start to gain more confidence more and more and will start doing it. I also feel the same way for the girl giving off the confusing behavior. It seems like you're doing that too.
Recap: Just say hi to him, he'll say hi back eventually. When it seems like he's stone solid or something when he's near you. He's probably showing and exploding all of his emotions once you're gone. Hopefully, for you saying hi to him, he'll start liking you more and more. The girl I liked stopped giving me signs for a week and when the first time I said bye to her, she ignored me(that gave the finishing blow to me). Then she started giving signs again but more physical with me. Also, try to initiate conversations with him such as going up to him in class and just talking to him.