The fact you said that girl and guy talk for hours /every/ day may be a sign.
Guys don't like to always be smothered and since this relationship is new, he may just want a break. Whether he took part in the convos or not, he could still want a small break.
I only see my bf maybe once or twice a week when I can readily see him every day. I find this A LOT better. Not only am I spending all my time obsessing over when I'm gonna see him next, he doesn't have to worry either and he's free to do his own thing when he wants and make his own plans. We talk on the phone every now and then.
I think this is a good way to go seeing we've been together for 3 years

When I do see him, we spend several hours together, holding each other and enjoying each other's company while it lasts. We used to be SOOOO clingy to each other 2 years ago or so, and it broke us apart a little. I got kinda sick of him being so clingy, started going to a different school not by my choice, then when I saw him again, I got clingy and I know he didn't like me being /that/ clingy. So I distanced myself a little to only see him every now and then. It works well.
Think of it this way:
If you don't talk to/see the guy for a while, your next meeting will be even better because you've wanted to see and talk to him all that time.
It may be a little different for everyone but this definately works for me. We're still young (me and my bf) so we don't need to worry about being together 24/7. Even married couples aren't with each other THAT much. They have several hours aparts and in some families, days and weeks for job trips and such. It's good to never let yourself get /too/ attached to a guy to the point where you freak out if he doesn't talk to you for a day. Just take it calm and day by day. If he decides he wants no more, fine. Let it be. Don't pester him. But there's a chance he just wants a break so I'd give it time and maybe talk to him bout it in a day or so to see what is really up if anything. If he says nothing is up and you guys go back to the way you were - don't pester him bout it less he acts suspicious. (When I say you and what not, I'm just meaning in general and not directly at you)