Well to peer into the guys mind can be hard. We often can retreat to our cave whether thats in our head or into a room to zone out. This feeling manly comes from being so overwhelmed with $#%@ it stresses us out. When this happens we become emotionally unavailable. Sad yes but this is something I often do in my relationship, and my wife is extremly un happy with it. My wife recently stated she wants a divorce, which I in turn started to see a counslar and founr out I was deppressed. So I have started to take meds, but afraid that its to late to fix. So perhaps he is depressed because he feels he isn't reaching his goals or getting what he wants out of the relationship.