The second cover, which features Robert Smith of The Cure, was digitally released as a non-album single on October 26, 2010, alongside a music video.

Commercially, it appeared in the singles charts of Australia, Denmark, Scotland, and the United Kingdom, and was certified gold by Music Canada.

[6][7] "Not in Love" was sent to American alternative radio on January 11, 2011,[8] and an accompanying music video that was directed by Nic Brown was released the same month.

[13] Critics generally considered the album version of "Not in Love" unexciting;[12][14][18] Pytlik said the track "barely seemed to make a dent" when it was released.

[12] Drowned in Sound's James Lawrenson said it could be considered "filler" and "dropped as a B-side",[18] while Cosores of Beats Per Minute described it as "pretty pedestrian".

[5] Larry Fitzmaurice, also writing for Pitchfork, said the song is "massive", evoking chills, and that while it is a cover, its "high-definition angst" feels unique to the band.

[13] According to Scheetz, Smith's emotional vulnerability reveals "the tender longing[s] beneath Crystal Castles' cool, icy facade".

[1] Brandon Stosuy of Stereogum said the cover could be considered the best The Cure song in years, while providing a new perspective on the "saturated, blasted goth-noise prettiness" of Crystal Castles.

[22] Slant Magazine staff said: "[t]he crunchy production combined with Smith's familiar pangs is heart-wrenching and nothing short of blisteringly gorgeous".

[23] Molly Beauchemin from Pitchfork described the song as having an explosive, "life-affirming" chorus that transitions into Kath's tender interludes with "triumphant precision", calling it one of Crystal Castles' "finest, most cathartic ballads".