Most Helpful Guy
The best advice is to get busy: Try a new hobby, focus on finishing school, go travel with friends, anything that will get your mind off him. Your goal should be focusing on doing what makes you happy. Life is too short to waste on waiting for someone when you could be meeting someone new or enjoying life. Let things flow and happen naturally and someday you will meet the right guy.
Most Helpful Girl
Okay so first, yes, what you're feeling for this guy may be real but I promise you that if/ when it's over between y'all, months to a year later, you'd barely remember him and / or barely care. This is coming from someone who has fell for a few guys in my teenage years thinking I was in love, what I had or thought I had was real, I'd never find anything like it again, etc. Your ex may not be ready for anything real, y'all are only 16... everybody isn't wanting a real relationship at that age. If he's able to leave you so easily, he doesn't really want to be there in the first place and him coming back doesn't justify his love for you. No matter how good or bad a relationship is, you're going to have your good times full of laughter, love and smiles and you're going to have you're bad. The presence of either time doesn't give more or less reason to not end things. I hope you get what I just said but if you didn't, just because you have a few good times doesn't mean y'all should stay together especially if there's not much else holding the relationship together. At the end of the day, don't hold out hope that he'll come back to you with his huge reality check that he needs you and is on his hands and knees begging you to take him back because 9/10 it won't happen and if it does, it's a huge chance that he's just using you to pass the time.
You won't get over this easily but with due time, you will