@pinkevil666,
Well, he's not around so you are, what's the opposite of demonizing? You're mentally making him out to be better than he is, simply because he's out of sight. There's a whole kettle of unknown
stuff about him, and you get to fill it in with lovely fantasies. That he takes in stray puppies. That he gets the best grades. That he kisses better than anyone. That he helps little old ladies across the street. Etc. etc. etc.
And there's nothing wrong with fantasies and crushes, long as you recognize that that's what's happening. It's perfectly fine and normal. Reality, however, is probably far different. His grades may not be perfect. He may text while driving. He might not call his mother as often as he should. He might be a lousy lover. Who knows? Neither you nor I do, that's for sure.
When he returns, find out some of these things for yourself (I'm not suggesting that you sleep with him). That is, get to know him as a person. Yeah, you're shy and giggly around him. Welcome to what being a teenaged girl is all about. But ask -- do you want to go to the movies? It does not have to be a date. Just get to know him. He may be fun. He may be a jerk. He may be somewhere in between.
But you'll never know unless and until you replace the fantasy with the reality.