Jack didn't want to talk about things. Hell, in the past several weeks, he had talked more about feelings and things in the past than he usually liked to. Yes, it had been important but at the same time? Jack liked letting things (like emotions) lie. Ianto knew without him ever saying the words, so what did it matter?
It wasn't only that his people touched more often (though that was a fair hypothesis, Jack conceded) -- it was that Jack was comfortable enough with Ianto that he could show affection. And when he had as much trouble saying certain words, showing was easier than saying, wasn't it?
"Because you know everything," Jack intoned with a final squeeze, going to retrieve his mug once more. "Any other suggestions?" Jack asked, attempting to push past that conversation.