Doesn't call or text anymore...do I bore him now?

So I reconnected with this guy I knew when I was about 14, we've been talking for a few months ago...but he lives in another state..and I haven't seen him in 5 yrs. But for the past 2 weeks he's seemed kind of different...he doesn't finish training until about 9 his time--which means about 12 my time...and I have 8 am cles in the morning cles. So we haven't really talked in over a week, and even this weekend he hasn't tried to contact me...it just seems like he's out of it lately. He's a marine, so I guess this might be normal? Is he tired of talking to me? Or maybe he's rethinking the whole long distance relationship thing? I don't know, advice please?