What are some of his "complaints"? Has he given you any examples other than say that he doesn't love you anymore? This is a good time to really listen to what he has to say, even if it's something you don't want to hear.
A "crisis" can strike at any point in life. My H's actions and words during and after the bomb fit the MLC description, and he's only 33.
Knowing that you don't have a lot of "face" time with H in the upcoming weeks, and then his deployment, make it difficult to just focus on today. It doesn't sound like he's mentioned a D or S, so that's a good start.
Since you're familiar with the rules, give him space and don't pursue. Don't bring up R talk, don't persuade him to stay. If he wants to leave, as hard as it is, give him the space that he's asking.
You mentioned a few things that you were doing, like going to a friend's. What other things can you do? What can you work on to make you better?
