Written by Stevie Wonder, this is about a breakup he had with his girlfriend at the time, Syreeta Wright. Wonder wrote the song with Lee Garrett, a songwriter who also co-wrote Wonder's hit "Signed, Sealed, Delivered."
G.C. Cameron had joined the band as lead singer at the time of this song's initial release. In 1972, The Spinners switched record labels and moved from Motown to Atlantic. Cameron stayed with Motown as a solo artist, and was replaced in The Spinners by Philippé Wynne, who sang lead on most of the group's hits in the '70s.
Jazz guitarist Paul Jackson Jr. made a smooth Jazz version of this song for his album Still Small Voice. Paul's version was also featured on the compilation album Blue Note Plays Stevie Wonder, a series of covers that was a tribute to Wonder.
In 1990, British-born singer and rapper Simone Wilson, the artist better known as Monie Love, sampled this as part of her song "My Sister," a song that also talks about the emotions of a breakup after the accusations of an alleged love affair. (thanks, Annabelle - Eugene, OR, for all above)
Lethal Bizzle, a former member of More Fire Crew, sampled this on his 2005 song "Fire."
The Jamaican Rock Steady singer Alton Ellis recorded a version of this song that appears on his album Darker than Blue: Soul from Jamdown.