Bob seemed to have lost all interest in his packing.

I turned to leave him without a word.
"I am awfully sorry!" he was the one to say again.

I began to wonder when he would see all round the point, and how it would affect his feeling (to say nothing of his actions) when he did.

Meanwhile it was Bob who was holding out his hand.
"So am I," I said, taking it.
And for once I, too, was not thinking about myself..