I understood now that trying to understand why two people fall out of love is a bit like studying a place that existed before photographs, pre–printing press, a time that is kept alive only by the stone foundations of burnt cottages and buried barrels of mead found by determined archaeologists or lucky farmers. We may have the evidence—the daily messages exchanged between former partners (“baby cakes, do you like these curtains or do they make you think of Vegas?”), the iPhone images of early courtship (hands entwined on the plane to a new city), and the devolution (absent-eyed in New Year’s hats that read 2017 in hopeful glitter). But we can never be the people who occupied that place. Even if we were them once, we can’t be them again. The world they shared dies along with their memories.