Boyfriend(23M)of 2 years moving away to another country for his Master's degree

I(23F) am really heartbroken. He wants to be in a long distance relationship but I dread it. We have been in one for the first half of the relationship and it wasn't going well for me because he wasn't as available as I'd like him to be. He promises he has grown closer to me since he spent the year with me.

But he just seems really casual about this whole thing. I, on the other hand, am panicking and been a slobbering mess all around. He hates when I mention that I want to let it go because I don't think this will work. I love him and want a life together. I am mad because I never got a say in this choice and he is just leaving. I want to be supportive but this is breaking me apart. He wants me to not let it go because I might pursue the same course next year and we'll be in the same country again. I don't know what to do. Help me, reddit?

Tl;dr: Boyfriend moving away. He wants to be together but sometimes emotionally unavailable. I can't decide.