Instagram/Lena Dunham & Jack Antono Celebrity Lena Dunham reveals intimate details of her 6-year relationship with Jack Antonoff in her memoir "Famesick," including her dependency and their 2017 breakup. April 15, 2026 AceShowbiz - Lena Dunham has revealed intimate details about her relationship with ex-boyfriend Jack Antonoff in her recently published memoir, Famesick. In the memoir, Dunham reflects on the early stages of their romance, describing Antonoff as a man with "strong arms" and "good instincts," recalling how models on video shoots would slip him their numbers on napkins.