In love but scared of long distance relationship

So I am craving some advice here, I am inlove with this really handsome guy, he's a darling, he treats me so well but has little time for me. After our second date he stayed over at my house and I could not resist his touches, so we made out and the other times I went to his place and he came to mine. My concerns are that he will be leaving for another country for a while but he promises that he will still be my boyfriend and we will try and make this relationship work due to the distance but I am scared that it won't work. I love him and he says he loves me too. I think of him first thing in the mornings and last thing at night. when I don't hear from him I get crazy.

I just need some advice, maybe some of you have been in a similar position.