I'm sorry Dusty rejected you and I know how painful that can be. I remember going thru that myself when I was a teen MANY years ago. It really devastated me.
But you can't keep thinking about this guy. There are other guys out there who deserve your attention, plus you're taking attention away from your studies too. You don't want to mess up your grades by thinkiing about this guy all the time.
Unfortunately, he's just a waste of your time. So find someone who CARES about you and who DESERVES you -- this guy doesn't.

He doesn't deserve your time. Best of luck hon, and take care. Hugs, Lee