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Lena Dunham’s ‘Famesick’ Confirms She Cheated During Jack Antonoff Relationship

The memoir revives old internet theories without offering new proof.

Overview

  • Dunham’s memoir Famesick, released Tuesday, details a weeks-long sexual encounter with a childhood boyfriend named Nick during a pause late in her five-year relationship with Antonoff.
  • She recounts Antonoff’s intense studio time with an unnamed “teen pop star” who spent time at their home and called her “Aunt Lena.”
  • The book does not name the singer, and past speculation has centered on Lorde and Antonoff’s collaboration, which both have publicly denied.
  • Dunham ties the breakup period to a 2017 hysterectomy for endometriosis, a growing dependence on post‑surgery medications, and an April 2018 rehab stay.
  • Coverage of the book has rekindled years‑old fan PowerPoints and posts, but there is no new corroboration or formal inquiry beyond Dunham’s account.