You hear this from a tired dad sitting on his lazyboy and drinking a glass of scotch after a long workday.
That's exactly how it sounded in my head. Flat. Angry. Out of nowhere, and full of spite. Mid-TV Show. Not even on a commercial break. FOR FUCKIN WHAT?! WHAT DID I DO?
He's having an existential crisis but is so tired and worn down that his revelation of depression can only come out as a tired monotone.