I'm sorry I don't have any magic words to make you feel better. All I know is that the more you adored him, liked his presence, or maybe even loved him, the harder it will be once he leaves. But then you should cherish your time together, it's the happy memories that will never leave you, and ask yourself the timeless question: Better to loved and lost, then to never loved at all.

All I can say is that if you pick the second choice, it shouldn't matter if he's leaving then.

I hope that some day you will move on, stronger from this experience into your next adventure in life.