I was just thinking about this the other day... last time I saw my SO, he was so stressed and having the worst day ever... and he's the type that shows it, even if he tries to ignore his problems and change the subject to something else. I could still sense it, even though he says he feels better when he sees me... but I just didn't know what to do or say. It's not like I could just ignore him because we had plans to meet that day... so, I just kept quiet and didn't ask him about what happened. He didn't seem to want to discuss it anyway.
I guess guys are just like that... they would rather not openly talk about it and like to be left alone.