My boyfriend and I are together for 9 months. We love each other and everything is good, but there this one thing I can’t stand...

Communication. We go to different school and we can’t see each other every day. That’s fine. We talk every night before going to sleep. But almost every time (at least once a day this happens) I text him and he doesn’t answer. I have to wait sometimes like 2 hours, but I see him casually watching videos on instagram or whatever he is doing there. Of course I start to panick and wonder if he is talking to other girls, what’s wrong with us etc. Every time I’m like: ,,It would be nice if you answered me.” he starts apologizing and again it’s all perfect... Do you think I’m overreacting? How can I fix this?