"You Lost Me" is a song by American pop recording artist Christina Aguilera, from her fourth studio album Bionic. It was released as the third single from the album (second internationally) from June 29, 2010 in the United States and September 2010 for Europe. Written by Aguilera, Sia Furler and Samuel Dixon, the pop-ballad speaks of breaking up with one's old partner and discovering his infidelity. The song received mostly positive reviews from critics who noted that the track showed the strength in Aguilera's vocals but it lacked the same dynamics as her earlier ballads.
The song was not commercially successful in the United States, missing out on the Billboard Hot 100 chart but the song's Hex Hector/Mac Quayle remixes managed to top the Hot Dance Club Songs chart. An accompanying music video, directed by Anthony Mandler, features a series of connected vignettes highlighting a devastated.
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