Is there a problem? or are we settling into who we are...?

My boyfriend and I are coming up on being together six months. We don't argue really, but lately, things are changing. Like, we used to text all the time, and he never really texts me anymore... if he does, it's just to figure out our plans for that day. We only get to see each other one or two days a week because we live an hour apart. I've tried to ask him about it, but he told me that i "worry too much", and that it bothers him that I think that theres a problem... he thinks I dont trust him. I do though! one friend said its just a six month slum, and another said that the new is just wearing off, and that were settling into being a couple... I am still worried that he's thinking about breaking up with me though. Guys,.. what do you think?