I feel sad

my bf and I have been dating for a little over a year now. Halfway through our relationship he had to move to Germany and has started college there. I live in South America, so we’re currently in a long distance relationship (with 6 hours of difference). We’ve never really had big problems, but recently I’ve been feeling down because of things he does o doesn’t do. For example, about two weeks ago I traveled with my friends. During the trip I tried to talk to him as frequently as I could and would send him pictures and tell him about my day. I ALWAYS made time for him and tried to make him feel like he was a part of my day. He recently traveled as well but during HIS trip, he barely talked to me (probably like 2 times a day). He told me that this happened due to the fact that his charger broke and he didn’t have much battery. The thing is that he traveled a few months ago and he did the same thing. Now I feel confused because I don’t know if I’m exaggerating. I want him to enjoy his trips, but I also feel that he doesn’t put as much effort as I do. I feel like que doesn’t care much and that makes me feel sad.