Why does he wanna leave

Hi, so me and my husband have been married for almost 2 years now we were the happiest couple. We are a military couple. He joined when we got married we got married in October he left in February he was in basic in AIT for about seven months, we moved to Washington where our duty station was we live there for about six months then he got sent on a rotation/deployment for 9 to 12 months he left in February for that and he should be getting back until September October. Well, we had had a rough time since he’s been going. It’s been rough obviously we have had some arguments he wanted to stay in for 20 years and I told him it wouldn’t be fair to me because he wanted to live overseas and I wanted to be close to my family but we talked about it and we talked about sticking together. I wanted to be with him he wanted to be with me. He’s my family now and I need to focus on him. Well, we got over that this past Wednesday we were on a three-way call and I hung up because he was kind of being cocky, I hung up he didn’t text or call me that whole day then the next day he didn’t text me really and it was always just been dry and we would just leave each other on delivered or open well on Saturday. He was at a cookout and he don’t drink, smoke cuss nothing bad. apparently his friends was forcing him to drink he drunk he went to his room after well on Sunday we were texting. It was dry. I wanted to talk to him, but I just didn’t wanna argue well he texted me, He told me that he thought it would be there for the best to go our separate ways that he didn’t wanna hurt me no more that we were always arguing. He didn’t want to drag me across the world all the time he wanted me to be close to my family. He just thought it’s for the best to go go our separate ways he said that I deserve someone better, well I begged him to work it out and he just kept saying he thinks it’s for the best. Well I haven’t heard from him since Sunday. He won’t text me back. He won’t respond. He viewed all of my messages just won’t respond. His sister messaged him yesterday and he said that he was at the bar drinking all day and the messages he was saying I felt like he was kind of being like cocky he was saying something about saving the country and she said well maybe you need to focus on God again in talking to your wife and he said absolutely, but before all of this, we were the happiest couple everyone would say they were jealous of our relationship like he was truly the best husband ever like it is crazy how perfect he was. I just don’t understand last week. We were talking about our future when we get back to Washington and now he’s done at four 360 of wanting to be living overseas doesn’t want a family and I don’t think it’s another girl. He’s not that type of person but I do feel like he sees his friends having fun and he wants that too, but I don’t know if it’s also he’s just super depressed. He gets in these depressed states really bad and his deceased sister‘s birthday was just the other day and he was upset about that and not being here. He started a new position at work. I don’t know if it’s because we’re so far away from each other. I don’t know what to do I don’t know what to say to him. I don’t know nothing and he won’t talk to me. He said that he will be leaving for a month and will have no contact but he read all of my messages and told his mom that he will leave the 23rd. I really don’t know what to do please help.