Consider the connective tissue holding a long-term marriage together: a web of understanding based on personal history—years of discussion, arguments, realizations, inside jokes, terms of endearment, intimate gestures, memories of private moments. Then think about a spouse suddenly losing all that backstory, and in the process, losing the personality that made you fall in love with him or her in the first place. Now you’re married to the same physical person, but the persona has been wiped clean, like a hard drive. Who is this new spouse in your bed? Are you still in love? And if your partner can’t weigh in on your shared past, what counts as the truth?

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