Dear me,
What's going on? You have priorities and you have goals. I know you. I know you want things and yet here you are, all wrapped up in your fantasies, over a guy that you liked during your senior year of high school. Really?
What's wrong with you?
You're in college. You should've moved on. He doesn't like you. He never did and we both know that. Okay, I'll give you some slack. You didn't know for sure. But to be fair, you could have. You could've taken initiative, you could've asked him out, hell, you've literally annoyed the crap out of your friends to seek what limited advice they had since both of them were single.
Just move on.
For some reason, you actually hoped that somehow he felt the same toward you. So what if he told you that he liked one of your poems? So what if he doesn't ignore you when you text him despite the fact that he's totally fed up with you? So what if he liked a few things on Facebook? He was just being nice! He probably felt sorry for you. I don't know why you didn't have any problems back then, or did you?
Move on.
Couldn't you read the signs? You started the conversations mostly. You asked him to homecoming, only to find that he was taking someone else. You asked him to play a duet with you on an upcoming recital only to have him turn you down. Youcould've asked him to go to prom, too, but you assumed, like last time, that he'd take someone else. But instead, he was watching "Titanic" alone on a Saturday night.
Move on.
Senior year is over. High school is done. He moved elsewhere. He's going to college. He's serving his mission. He obviously has priorities of his own. You cease to exist.
Move on.