Hi! I am not sure of the context of the long distance, whether it be high school or college, but regardless- it is difficult! As I am in a long distance relationship, I can tell you that it takes commitment!
With that being said, it is often difficult to make that commitment when there wasn't a sturdy relationship beforehand (not that it isn't possible!) It does get tiring having to wait to see that other person, and I honestly think that might be the case here. He may just feel discouraged about it going anywhere, depending on the circumstance. If you do have that good of friendship, be honest and ask. That may make you nervous, but it will constantly weigh on you if you don't know. It seems that you are very important to him, and people are complicated. Let him know that friendship is important to you too, but you deserve an honest answer.
I hope this helps!