Songfacts®:

• Billie Eilish teamed up with Spanish singer-songwriter Rosalía for this alluring ballad. Backed by atmospheric synths, the pair sings sometimes in English but predominantly in Spanish. The song title translates as "Will You Forget It?"
• The bilingual, somber track finds Eilish and Rosalia soliciting forgiveness as they hope a romance won't be forgotten. Rosalia kicks off the song by asking a past lover, "Dime si me echas de meno' aún" ("Tell me if you still miss me"). The two singers continue to address the ex who is giving the impression the breakup didn't upset him. However, the guy is expressing animosity towards his former girlfriend, signifying her love was more important to him than he admits.
• The melancholic song was a long time in the making. Eilish and Rosalia's first joint recording session was in Los Angeles in January 2019, where most of the track was written and recorded at a piano. The pair held a second collaborative session six months later, but the tune remained unfinished due to scheduling conflicts.
  
  Once lockdown started because of the COVID-19 pandemic in March 2020, Rosalia found the time to work on the arrangements and her vocals. After Eilish sent her vocals a couple of months later, the song was completed. Darkroom and Interscope released the single on January 21, 2021.
• Billie Eilish and Rosalía wrote the song with Eilish's brother and collaborator Finneas, and with Rosalia's go-to producer El Guincho. Finneas also provides a trademark sparse production. "It went through lots of stages, which is kind of rare for us," Eilish told Zane Lowe on Apple Music. "Usually the production we do is the production we end up with. This one was really not that way. It was two years. So obviously you're gonna change."
• Eilish told Zane Lowe she felt it was important that a lot of the lyrics are in Spanish. She explained that when Rosalia said, "It should be in English," she countered, "No, no, no. It should be in Spanish. It's so beautiful."
  Eilish added that when Rosalia explained what the lyrics mean, it meant even more to her. She told her, "That's beautiful, and the delivery is beautiful, and the emotion is beautiful."
• Eilish closes the song in English.
  
  You say it to me like it's something I have any choice in
  If I wasn't important, then why would you waste all your poison?
  
  The "Bad Guy" hitmaker enlisted the help of her entire family when she wrote the final words for the track. She explained to Zane Lowe that the whole song was done, except the last line. When she and Finneas, along with his girlfriend Claudia Sulewski, attended one of their regular Friday dinner and movie nights with their parents, they took them to the studio and played them the tune.
  
  "I was sitting in the room with my entire family," Eilish said. "We both, all of us, including my dad and my mom, they were like, 'What if it was like...' We were all giving ideas. So technically they should have a writing credit, because we all wrote that line right at the end."
• The song is part of the soundtrack of HBO's teen drama series, Euphoria and plays during the "Part Two: Jules" special episode, which premiered on January 24, 2021.