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Lena Dunham Admits Cheating on Jack Antonoff in New Book ‘Famesick’

Lena Dunham Reveals Relationship Turmoil and On-Set Chaos in New Memoir 'Famesick' Lena Dunham is opening up about the complexities of her personal and professional life in her second memoir, Famesick. Released on April 14, the book provides…

Lena Dunham Admits Cheating on Jack Antonoff in New Book ‘Famesick’

Lena Dunham Reveals Relationship Turmoil and On-Set Chaos in New Memoir ‘Famesick’

Lena Dunham is opening up about the complexities of her personal and professional life in her second memoir, Famesick. Released on April 14, the book provides a raw look at the creator of Girls, detailing the emotional toll of stardom, volatile relationships and her battle with chronic illness.

From admitting to infidelity in her long-term relationship with music producer Jack Antonoff to describing “erratic” behavior from costar Adam Driver, Dunham doesn’t shy away from the controversies that defined her rise to fame. Here is a detailed look at the biggest revelations from the memoir.

The Breakdown of Lena Dunham and Jack Antonoff

Dunham spends a significant portion of Famesick reflecting on her nearly six-year relationship with Jack Antonoff. She describes Antonoff as a source of assurance and beauty in her life, noting that his choice to be with her made her feel lovable.

However, the relationship faced severe strain toward the end. Dunham reveals that following a hysterectomy in November 2017, the couple had their “worst-ever fight,” leading to a “pause” in their relationship while Antonoff went on tour. The memoir confirms that Dunham cheated on Antonoff with an old school friend one week before their official split in December 2017.

Dunham describes the final breakup as a tearful encounter over breakfast, where she admitted they were no longer making each other happy, ending their years-long partnership with mutual weeping and a delusional request to continue going on dates.

On-Set Tension: Adam Driver’s “Erratic” Behavior

While Dunham praises Adam Driver as an “incredibly present” actor who often pushed her own acting abilities, she as well details a darker side to their working relationship on the set of Girls. She describes Driver’s behavior as unexpected and, at times, volatile.

In one specific instance recounted in the memoir, Dunham recalls practicing lines in her trailer when she suddenly found herself unable to speak. According to Dunham, Driver responded by screaming, “FUCKING SAY SOMETHING,” and hurling a chair against the wall next to her. She also notes that during an early sex scene, Driver ignored the careful blocking and “hurled” her around.

Health Battles and Personal Struggles

Beyond her relationships, Famesick delves into the physical and mental health challenges Dunham managed while leading her HBO series. She discusses her diagnoses of Ehlers-Danlos Syndrome and endometriosis, conditions that required multiple surgeries and daily pain management.

The pressure of being the head writer and star of a hit show, combined with the volatility of online praise and criticism, contributed to a period of intense anxiety. Dunham reveals that this led to an addiction to the anxiety medication Klonopin, which eventually necessitated a stint in rehab.

Professional Fallout and Legacy

The memoir also addresses the professional dissolution of her partnership with Jenni Konner, her longtime business partner. By detailing these falling outs alongside her health struggles, Dunham paints a picture of a woman attempting to navigate extreme success while dealing with internal and external chaos.

Professional Fallout and Legacy

Key Takeaways from ‘Famesick’

  • Relationship End: Lena Dunham and Jack Antonoff split in December 2017 after nearly six years; Dunham admits to cheating one week prior to the breakup.
  • On-Set Conflict: Dunham describes Adam Driver’s behavior on Girls as erratic, including an incident where he threw a chair.
  • Medical History: The author details her struggles with endometriosis, Ehlers-Danlos Syndrome, and a hysterectomy.
  • Mental Health: Dunham reveals a period of Klonopin addiction and subsequent rehab to manage anxiety.
  • Professional Shifts: The book covers her falling out with business partner Jenni Konner.

With Famesick, Dunham moves beyond the curated image of her public persona, offering a candid look at the cost of visibility and the messy reality of growth through pain and failure.

About the author: Lila Roberts - Entertainment Editor

Eight‑year veteran, known for exclusive celebrity profiles and festival coverage (Cannes, TIFF, Sundance). Lila tracks streaming wars, box‑office trends, and music industry shifts. “Lila Roberts spotlights film, TV, and pop culture trends—bringing insider access and insightful critique.”