The couple, who parted ways in 2013 after dating for several months, are still remained friends, reported E! online.
The duo joined hands for the new version of former Wanted member's love ballad.
Sykes, 22, debuted the new track on Friday.
"It's such a special song to me, and I'm delighted that I'm able to share this with not only a friend of mine but also somebody who is incredibly talented," he said in a statement.
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