Maybe it is a liberty of younger people to think that the best mate is the one you don’t have: a stranger you haven’t met yet or an improved version of your current partner. It favors the future over the present and past—natural when the future looks long and full of potential, less so when you know what’s coming. But it also obscures or diminishes the partner you really have. Ruth, John, and my mother all preferred the satisfactions of the life partners they’d had, whatever their shortcomings, to the unknown.
