"You Lost Me" is a song by American recording artist Christina Aguilera, taken from her sixth studio album, Bionic (2010). Described by Aguilera as the "heart of the album," the song was written by Aguilera and Sia Furler, with the song's producer Samuel Dixon. The song lyrically talks about a cheating man, who has left the world in Aguilera's view as "infected". The song was released on July 6, 2010 by RCA Records as the third and final single from Bionic.
The music video for "You Lost Me" was directed by Anthony Mandler. According to Aguilera, "strips back the theatrics". She also revealed that it used over 200 pounds of charcoal. During the making of the video, Aguilera said, "It was really important that I interpret the simplicity of the raw emotion that takes place within the song itself and not any sort of theatrics involved." On July, 22nd, 2010, "You Lost Me" video was released on Aguilera's VEVO channel. Two days before the release, a sneak peek of the music video was revealed. According the Billboard writer Monica Herrera, the clip contrasts with the music video for the lead single, "Not Myself Tonight", while Chris Ryan for MTV Buzzworthy thought that it goes "back to basics".
The video features Aguilera with "strawberry-blonde" hair. It begins with a close-up of a gun barrel. Then, she slowly walks through a "deserted" bedroom and lies down in the room, which is filled with charcoal, while crying. She is seen with mascara streaming down her cheeks. As the scene moves on, Aguilera is fighting against a shirtless man, who is considered her lover. The clip ends as Aguilera takes off her shirt in an "Inception-like dreamworld". Critical response to "You Lost Me" video was positive: Latina writer Mariela Rosario and UK magazine OK! noted that the clip was a comeback by Aguilera following the video for "Not Myself Tonight". Monica Hererra from Billboard also thought that it represents "a kind of return to form for Aguilera". Writing for Entertainment Weekly, Brad Wete thought that the video for "You Lost Me" "has some quality material". Similarly, MTV Buzzworthy's Chris Ryan complimented it as one of Aguilera's best videos.