Leaving to join my marine at Ft. Gordon in two months. Whats up with his lack of feelings?

So I love my boyfriend who is respectfully a US MARINE. I know nothings more important to Him than his job and I'm stoked about a future with him. He just checked in with his command in Augusta GA and while I know he is super busy I can't help but notice his lack of... I don't know... I want to say interest but its not really that. He just came and spent 3weeks with me b4 checking in and it was clearly amazing. I just noticed that since he's been back in GA he's been too busy to talk. I'm fine with that, hell, I'm busy too and don't tie him up in all that self absorbed talk to me look at me why don't u talk to me bullshit. But I hope that I'm not driving him crazy with my 2-3 texts a day and random pictures. After so many without a reply u kinda start to wonder though. I know he loves me, he has for years... I just don't want to feel like "that one chick". Can someone shed some light or comfort on this for me. Is it so busy when you first check in to your new post as an e6 ssgt? Marines are loyal and I love that. If his mind about my son and I moving out there in a few months had changed or will change he'd say so right? I know nobody can really answer this but maybe somewhere a marine wife or gf has experienced the same wonders and can at best talk to me about it. Please do so.