Changes.

So the last time I wrote on here I talked about a guy that I was talking to from Korea. We ended up getting back with each other because he gave in to his heart. I know he really likes me and cares about me. The only thing is I don't like the long distance relationship we're in. I want to be the first thing to come to his mind when he wakes up and the last before he sleeps. I want him to be like before when he was still in Korea. He was always so eager to talk to me and video call me. He answered me right away and made jokes and we'd both crack up. Now it seems like he is too busy to even have a girlfriend or even care about keeping me. He sees my messages sometimes but he doesn't reply. He doesn't video call or voice call me anymore. He barely even type back and when he does its really short and prompt. I don't know what's going on with him and I can't even ask because I don't have a chance to. Did he fall out of it with me or is he just busy? If he's busy why can't he just say it. This is driving me insane. I was thinking about staying in Asia for an extra week to be with him but now I just feel blah. He's not giving me a chance. I know he has school and is busy studying but a simple text doesn't kill. I feel like whatever we had is lost..I don't even know how to describe this feeling. I don't want to be pushy and needy but I am a girl and that's the type of attention we need from men. He doesn't even express to me anymore. He doesn't tell me how much he misses me or how much he likes me like he did before. What changed? I feel like there's a barrier and it's hard to break it if he doesn't let me in. I became expressive and loving towards him and now he shuts me out..just great! What do I do? Why did he change all of a sudden when we are going to meet in a month..?