distance sucks.

Okay so my boyfriend and I have been together for almost a year and we spent literally all summer together and now he's back at school which is 2 hours away and I'm feeling like we aren't in as much contact as we were before. 
Don't get me wrong, I understand that school work is a lot and he's not going to be on his phone 24/7 but he's been not as talkative as he once was. 
He doesn't text me for hours and when he does it's like he never left and he's not as caring I feel like. We used to FaceTime every chance we could but now I'm lucky if it's once a week. I don't know, I just feel like we're drifting.. maybe I'm just being paranoid or acting crazy? 
I told him I was feeling insecure and I'm not as happy as I usually am because I miss him (which is completely true) and that day he was the sweet boy I knew but now it's like he's back to being the distant person again. 
Am I being crazy? Do I need to chill? What do I do?