{"id":234464,"date":"2026-04-14T15:39:11","date_gmt":"2026-04-14T15:39:11","guid":{"rendered":"https:\/\/entertainment.runfyers.com\/index.php\/2026\/04\/14\/lena-dunham-reveals-she-cheated-on-jack-antonoff-before-split-biggest-bombshells-from-new-book\/"},"modified":"2026-04-14T15:39:11","modified_gmt":"2026-04-14T15:39:11","slug":"lena-dunham-reveals-she-cheated-on-jack-antonoff-before-split-biggest-bombshells-from-new-book","status":"publish","type":"post","link":"https:\/\/entertainment.runfyers.com\/index.php\/2026\/04\/14\/lena-dunham-reveals-she-cheated-on-jack-antonoff-before-split-biggest-bombshells-from-new-book\/","title":{"rendered":"Lena Dunham Reveals She Cheated on Jack Antonoff Before Split: Biggest Bombshells From New Book"},"content":{"rendered":"


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Lena Dunham<\/strong><\/a> discussed her relationship with ex Jack Antonoff<\/strong> <\/a>at length in her newly released memoir, Famesick<\/em><\/a>.<\/p>\n

\u201cThe best medicine was Jack. Here was this boy \u2014 no, at 28, he was a man,\u201d Dunham, 39, wrote. \u201cHe had strong arms, and good instincts, and models on video shoots who slipped him their numbers on napkins.\u201d<\/p>\n

Dunham added, \u201cI didn\u2019t realize it then, but as our relationship deepened, I relied on him for more than companionship and affection. His care for me, his choosing me, was an assurance that l was beautiful, lovable, being signed off on by someone who had every choice in the world and had made this one.\u201d<\/p>\n

Jack\u2019s sister Rachel Antonoff<\/strong> connected the now-exes, who began dating immediately after he sent the actress an email asking to get dinner. They were together for nearly six years, splitting in December 2017 after Dunham got surgery to remove her uterus.<\/p>\n

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In her book, Dunham revealed that she cheated on Jack one week before their split. She initiated their breakup<\/a> on a Saturday morning.<\/p>\n

\u201cWhen I woke up, he was in the kitchen. He said he was hungry, and we ordered breakfast, unpacking egg sandwiches and bacon strips from the diner where we had a charge account,\u201d she wrote. \u201cBut I couldn\u2019t eat. I couldn\u2019t speak. I couldn\u2019t pretend. \u2018I think we both know \u2026 we haven\u2019t been making each other ha-a-appy,\u2019 I stuttered before sobs overtook me.\u201d<\/p>\n

Dunham continued, \u201cWe put our foreheads together and wept. In some fit of delusion, I asked if we could still go on dates. \u2026 We told each other everything lovely that either of us might ever have wanted to hear.\u201d<\/p>\n

Keep scrolling for the biggest revelations about Jack from Dunham\u2019s Famesick<\/em>:<\/p>\n

Lena Dunham\u2019s Weeks-Long Tryst With Ex-Boyfriend<\/h2>\n

Following her November 2017 hysterectomy surgery, Lena Dunham and Jack Antonoff had their \u201cworst-ever fight.\u201d They ended up taking a \u201cpause\u201d in their relationship while he went on tour.<\/p>\n

It was at this time, Dunham reconnected with a childhood friend and ex named Nick. She explained that they stayed in \u201cintermittent email contact\u201d over the years.<\/p>\n

\u201cUp until now, I had seen myself as some kind of half wife, and so I had observed wifely code (you can masturbate thinking about someone oxidizing metal, but you can\u2019t touch!),\u201d she wrote. \u201cBut the events of the past few weeks had changed the game, and it was every woman for herself, just trying to survive.\u201d<\/p>\n

Dunham went on a date and took a cab back to Nick\u2019s apartment. She told him: \u201cI\u2019ve been through something awful. I don\u2019t want to talk about it, but I need you to f*** me and I need you to do all of the work.\u201d<\/p>\n

They continued sleeping together for the two weeks Jack was on tour. Dunham and Nick got \u201cengaged\u201d after her split from Jack, but they broke up after Dunham\u2019s April 2018 rehab stint.<\/p>\n

Lena Dunham Subtly Addresses Jack Antonoff Cheating Rumors<\/h2>\n

Lena Dunham wrote that she would often get emails from Nick during her relationship with Jack Antonoff, but she \u201cavoided real responses.\u201d Dunham also admitted that she \u201cnever stopped flirting\u201d even though she had a boyfriend.<\/p>\n

\u201cI had observed careful boundaries, never taking it far enough that I could be declared out of bounds,\u201d she wrote. \u201cIf I\u2019d wanted to look, perhaps I may have seen that Jack was not observing them as closely as I was. I wasn\u2019t paying attention, but the internet sure was, and they made some pretty amazing PowerPoints on the issue, so convincing they had me rethinking events that I myself had been present for.\u201d<\/p>\n

Elsewhere in the book, Dunham shared her distaste for Jack spending extended time in the studio with someone referred to as a \u201cteen pop star.\u201d She even mentioned catching the singer \u201cweeping into Jack\u2019s lap\u201d when she came home one day. (Theories have long swirled<\/a> about Jack and Lorde<\/strong>, one of his frequent collaborators.)<\/p>\n

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Lena Dunham Recalls Teen Listening to Jack Antonoff Song During Rehab Stay<\/h2>\n

In April 2018, Lena Dunham checked herself into rehab for a Klonopin addiction. While there, Dunham befriended a 19-year-old who she found listening to music one day.<\/p>\n

\u201cShe held her phone up. It was a song Jack had written when he didn\u2019t come back from the studio with Pink to see me at the hospital, one about hating someone but staying with them anyway,\u201d Dunham wrote, referring to Pink<\/strong>\u2019s 2017 song \u201cBeautiful Trauma.\u201d<\/p>\n

Dunham refrained from telling the teen that her ex had written the song. \u201cIt felt cruel to tell her its producer was actually scared that MDMA would drain his spinal fluid,\u201d she wrote.<\/p>\n

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\n Related: <\/span>5 Things to Know About Lena Dunham\u2019s Husband Luis Felber<\/span><\/a>
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\n\t\t\tPutting a ring on it! Lena Dunham\u2018s has happily gushed about her growing romance with now-husband Luis Felber as the pair started to show off their love on social media. The Girls creator, who broke up with ex Jack Antonoff in January 2018, revealed that she was in a new relationship earlier this year. \u201cIt\u2019s [\u2026]\t\t<\/p>\n<\/div>\n

Lena Dunham Spewed \u2018Psycho Stuff\u2019 About Jack Antonoff to Bruce Springsteen<\/h2>\n

Following Lena Dunham and Jack Antonoff\u2019s breakup, the actress found herself sitting next to Bruce Springsteen<\/strong> during a night out. Springsteen noted that Jack had become \u201cvery special\u201d to him over the years, leading Dunham to say \u201cpsycho stuff\u201d about her ex.<\/p>\n

\u201cFrom my mouth came a font of verbal diarrhea that sounded something like this: \u2018I\u2019m glad he\u2019s special to you because he promised to love me forever and that\u2019s not how it turned out and I may not have been perfect, but I would have tried and tried and now he shames me just for existing and I\u2019m going to write a memoir one day and I don\u2019t know how not to just call it I HATE YOU Jack, you BROKE ME Jack,\u2019\u201d Dunham wrote, recalling Springsteen looking at her with \u201cthe gentlest eyes\u201d before he replied.<\/p>\n

According to Dunham, Springsteen said, \u201cWell, Lena, this is the hard stuff. These are the questions artists must ask ourselves. And none of us had that answer, about how best to express our hurt through art. But when I was writing my memoir, I told myself this, again and again. First off, if it\u2019s boring, stop writing it. \u2026 And second, you don\u2019t owe it to people to be honest about every little thing. That doesn\u2019t mean you lie \u2014 it just means you can have secrets. You only owe it to them to show \u2019em how your mind works.\u201d<\/p>\n

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