I wouldn't move all the way to another country if the communication is already poor. He should be finding some time in his schedule to talk to you, not because he should, but because he wants to.
I am also in a long distance relationship. We have a huge time difference, but we make it work. I try to talk to my SO everyday, but that's not always possible because of how busy she is or when we are both busy. We do say something to each other once a day, though, even if it's just good night, small chit-chat, or saying we won't be online. Quality time is very important to me, and I imagine it is for her, too, so whenever there is free time, we make time for each other. Of course, this doesn't mean we don't have our own lives or interests or hobbies. Most of my day is doing my own thing, talking to other people, going to school, looking for a job, etc.
I shouldn't be bossing people around on what constitutes a healthy relationship, distance or not. Look at your love languages and what you need in a relationship to feel happy. For instance, I value quality time a great deal and words of affirmation. Touch is also a very big deal to me, but considering that's impossible in our situation, I make up for it by sending messages that include hugs, kisses, etc. Words of affirmation is easy to achieve no matter how far apart a couple is. I send my SO little love notes whenever I feel like it, and she does, too. Even if we can't have live time together, an email, forum message, text, etc. will do, just to let her know how much I appreciate her. Quality time - usually there is at least an hour a day in which we are both free, so we Skype together, look at things online, mess around. Sometimes we have a few hours to spend together, although that's harder to squeeze in given conflicting schedules. Sometimes there are days we cannot talk. That's what messages are for (this goes back to words of affirmation), and whether they are long or short, it says, "I'm thinking about you!"
Of course, my relationship is not everyone's relationship. You may not value the things I value, but there are always other ways to show that the person is on your mind, and that's what counts! Relationships take work, but it is work worth doing. In order to let something grow, or even to just sustain it, one must nourish it. It seems your boyfriend is really not putting in any effort at all. He either is unaware of his neglect of the relationship because that's just how he is (be it from different love languages, inexperience with this situation, whatever else is escaping me) or he simply does not care.
It would be best to bring it up with him and try to work things out. Perhaps seriously reevaluate the decision to move in with him given your concerns and the current state of the relationship. If he is a keeper, he will understand and try to put more effort into making time for you, whether apart or together. Figure out what you need (especially what you need at a distance) in the relationship to keep you happy and tell him you'd like more of that. See what he likes and needs and do the same for him. I mean this isn't to say he has to remodel his life completely to fit you in it. It's just little compromises that make the other person happier. Why? Because you care. At the end, that's the point of doing any of this ridiculousness.
Also, I should have said this way earlier - you are not being clingy at all. You like the guy and you'd like some reassurances that he likes you just as much. If he can't put in the effort now to show you how much he wants, likes, and appreciates you, what makes you think he will when you are together? Just out of convenience? The truth is, it will never be convenient. His life won't suddenly clear up once you get there. So, anyways, just bring it up with him and have an open, honest discussion about it and see what you arrive at. If he won't bother with any changes, or if he doesn't follow through, ask yourself if it is truly worth it. If it works out, that's great!