Strange Feelings

So my boyfriend and I have been together for almost 3 years. We've always had a phenomenal relationship; we never fought or argued, no trust issues or anything Iike that. Well; lately, I feel funny. Idk how I feel. I can't figure out what's making me feel this way. Sometimes I did myself getting frustrated with him more easily and not feeling comforted by things he says, but rather, annoyed maybe? I just recently moved an hour away from him (we had been living together since June) for school and these feelings are more consistent now, whereas before I moved I only felt them once in awhile and then it'd be fine. Now, I feel like when we talk on the phones he's quiet and we don't really know what to say and I worry that we are growing apart and I dreamt don't want that. But idk what to do. Maybe I'm just missing him and I don't know what that feels like because I've never had to miss him before? Agh. I need girl advice and I don't want to talk to any of my friends about it because I don't want to stir anything up yet. Please help! :(