Long distance relationships

My boyfriend and I have been together just shy of 2 years. He is 20 and I am 20. He is moving to the other side of the country this Friday. He is moving because he needs work and he got a job over there. Fair enough. We have complete trust in each other and we know he has to make this move so we can save money get married, buy a house etc. what I want to know though is how do I cope with this? I see him everyday and now I'll see him once/ twice every couple of months. Can anyone help me with how to cope with this and not be so down because I know I will be. I will miss him so much. He hasn't even left and all I do is cry.