He could be internalizing all the depression, so you would not see it on his outward appearance.

My h though I can tell the minute he walks in the door whether the depression has hit him or if he is upbeat and things are going well.

Me 50
H 42
S 22
S 9
D 7
M 12
T 17
H moved out 8/2006
H moved home 1/2007 for 3 weeks
H moved home 5/2011 for good

"Learn from yesterday ~ Live for today ~ And hope for tomorrow"