The lead single from Four, the song was penned by Louis and Liam with frequent One D songwriters Ed Drewett, Wayne Hector, Julian Bunetta and John Ryan. The same six songsmiths also wrote the Midnight Memories track "Little White Lies" together.

This was made available everywhere apart from Britain on September 29 2014. It was released in One Direction's home country a fortnight later. A remix of the recording by Liam (dubbed as the Big Payno Remix) was made the B Side in the UK.

The song is a piano ballad that has the guys lamenting about those who want to steal their girlfriends away. Julian Bunetta revealed to MTV News that there were actually several girls that inspired the track. "It's based on everybody's experience," he said, "you have six guys in a room that have all been in love before and we all have jealousy - some are better at hiding it than others, but we don't like when people hit on our girlfriends." "But it was more of a joyous thing, it just speaks to how happy you are with this person," Bunetta continued. "If you have something great, everyone is going to try and take it from you. And that also speaks to the fanbase, I think, 'cause of other groups [trying to steal the 1D fanbase]... there are a lot of layers."