Any idea's how to cope with this?

This guy, my best mate, the guy i like, the guy that likes me, he's moving 3,541.5 miles away this summer. And it's already affecting me. How do I cope with this? I've already missed one lesson at college because I was to tired from not sleeping because this is on mind and because i just didn't have the motivation to get out of bed. All i feel like doing is curling up in a ball and crying. Im basically numb with pain that i can't even cry much anymore. I'll have tears in my eyes and maybe have like 10 tears roll down my face. He's going for a job, he might not be back for years. I just am not coping. Everything seems so much harder now. I just need some advice on ow to get my motivation back. On how to cope with it. Even if I get over him he's still my best mate. Well best guy mate.