Last summer, a friend called bearing bad news: Her two-year relationship was finished. In between insisting that she was, in fact, totally fine, and that everything was probably for the best, she told me that her (now ex-) partner had accused her of cheating. My friend had not, to be clear, slept with anybody else, or gone on any illicit dates. But her partner, consumed by suspicion when it came to my friend’s platonic relationships, had gone through my friend’s phone and stumbled upon old