Some might say he's being "emo", but seriously; you don't get over the death of a loved one in a week, or even a few months. Especially if you also find yourself alone for the first time in your life.
He can still manage a quick smile once in a while and can still function pretty normally, though. I think he's being pretty brave.

He still knows all the songs. He just doesn't feel like singing.
Wooppeee! I managed eight panels again. This time I wasn't shooting for it -- it just happened. Hehe.
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nothing like that, he seems like a strong weasel with a heart of gold
That last panel is really lovely.