Originally in : The New Yorker.
An urban New York setting in which a young woman forms a relationship of sorts with two intense men. It’s a well-observed and detailed interdependent-troilistic relationship, and the sfnal element relates to the well-established sf time travel trope of the grandfather paradox, but the writing is subtle and clever enough to justify adding to that trope.
Correct: it is a subtle story, about love (incentuous?) , about time travel paradoxes and loneliness. Because the ending is left to the reader to figure out, many people felt the ending lame. I loved it.