She partnered with Grammy-winning production duo Mattman & Robin (Taylor Swift's 1989) and reunited with her best songwriting pals, Julia Michaels and Justin Tranter to make the Rare hit, whom she said she trusted "so naturally" throughout the cathartic recording process.
"This song alone represents what a lot of people who are heartbroken have gone through," she said. "One of the hardest parts for me to sing in the song was the bridge. It's the ending of the song, and that's the part where it's like, 'You know, I guess this is goodbye forever for us.' And that killed me."