Am I overreacting?

Recently my boyfriend moved across the country because he hated the state we lived in. We've been dating for 8 months and he said he wanted to do distance but I'm feeling like he's changed his mind because we haven't had a full conversation since he left a week ago. I haven't said anything to him yet but I'm feeling extremely hurt that we haven't said more than a few words to each other since he left a week ago. He knows we haven't talked because he apologized and said he's busy with moving stuff but then he goes on twitter and instagram and posts pictures and videos of him and his friends hanging out. I'm not a needy or clingy person and I've never been one to ask for his attention but I'm honestly feeling like he just doesn't care about me now that he's gone. He says he misses me and loves me so much but I feel like he just left me in the dust. I'm not blowing his phone up either, I only text him when I haven't heard from him all day. He's made no effort to actually talk to me at all and I'm feeling really sad and I'm preparing to talk to him about it. Am I overreacting by feeling upset and wanting to talk to him about it?