He found it difficult to sustain correct connected feelings. Not that he didn't sympathize or feel sad, remember better days, blame impatience.
Still he knew he had to behave well, do the right things, say the right things. A little quiet gentle humour might break the tension, but the ones left behind, those who were close had to be spared. The dead never cared.
Would he have felt like them? Perhaps. Normal life becomes unreal, closed down empty, far from the glittering eye, smothered, for some never to be recovered. He was a stranger at the funeral feast.