Military fiancé makes no communication! Need advice

Hello there! my fiance is currently deployed but comes home in August (thats when we are planning to have our wedding). he's not oversea. he is still in the country and except patrol not much to do. (most of his free time he spends playing video game) when I try to call him, mostly he won't even pick up and only "talks" through sending snaps. When I get luck and he will call me maybe once a week he's not talking to me and theres only silence on the phone. I try to make communication but I can try my best and it doesn't help. I have a good relationship with his dad who regularly tells me my fiance (his son) calls him every day but doesn't talk much either. I am planning the wedding and moving to TX where he is usually stationed all by myself. After the wedding we want to live on base together. But how I am supposed to make all decisions alone when he wont talk to me? I ask him if he maybe needs more time and maybe it's so early for him to get married.. but he says he definitely wants to marry me in August and he's just depressed. Also I have to see in person he is such different! in person you can actually have a serious conversation with him and he will be the planner and helps me wherever he can. I give up a lot for that we can live together (nursing school, my apartment, family ...) and I just wish he would be the same man on the phone that he is in person.

It makes me really sad and I feel alone. I don't have a lot of people to talk to I need advice what to do please...