My Marine Boyfriend

My boyfriend is a United States Marine .. we've been together for over a year now and he left for boot camp in December , I've seen him in a total of 8 days since then in the past  7 months, this is truly the most difficult thing I've ever had to overcome he's in California right now, I get to talk to him about once or twice if I'm lucky out of the week .. I miss him so much and I keep nagging him to talk to me more but he says it's not his fault, the only thing that I don't understand is why can't I get a simple good morning / goodnight text, yet he posts on Snapchat both of those times .. I've tried talking to him about it but man he just blames the core .. 😭