Does not answering mean he doesn't care?

Lindsey • Handle with care
Whenever I'm not around, like if I'm on family vacation or at college, my bf has a tendency to not text me back or answer my snapchats. I understand that he has his own stuff going on but I can't help getting a little annoyed. I know he has his phone on him so I can't understand why he ghosts. Am I being too needy?? It just makes me feel like I'm not a priority to him or that he just doesn't care. What do you guys think??