“No man is an island,” or so we’re told. And yet, something about couples, that two-for-one unit we humans are so wedded to… something about it lends itself to isolation. Once folks pair up, they have a tendency to slowly (or rapidly, depending on the couple) unmoor themselves from the social pangea and drift out to sea. At times, this disentangling is their own doing. Perhaps equally as often, however, the rest of us — the Association of Reasonably Invested Third …