Lena Dunham is getting personal about her past romantic relationship with ex Jack Antonoff.

The Girls actress, 39, details her romance with the Bleachers frontman, whom she dated from 2012 to 2017, in her upcoming new memoir, Famesick.

"Looking back, it's hard to understand why two people with seemingly endless options, financial freedom and almost nothing that they still enjoyed doing together besides talking s--- about the occasional third party would not simply break up," an excerpt from the honest new piece reads, per an exclusive sneak peak from PEOPLE.

"We were acting like we had six school-aged children we were in danger of losing custody of should we end the relationship," the passage continues. "But one of the last things we still shared was the sense that our ability to keep the relationship going was directly proportional to our inherent goodness."

The actress also revealed that the end of their relationship came almost immediately after she underwent a hysterectomy.

"You can have really beautiful relationships that don't work because of the specific moment in time," she writes.

In 2021, Dunham married Luis Felber, with Taylor Swift being the guest of honor at the wedding in London, per Page Six. Meanwhile, Antonoff married actress Margaret Qualley in 2023.