The British singer released the heartbreak ballad at midnight Thursday. The song, released on all digital platforms, speaks of a man who will "never let you close" because when he "opens up it hurts."
Smith, 25, explained the inspiration behind the song and gave more details about his forthcoming sophomore album in a recent interview.
"This song is about me and about a relationship that I was in," he told Zane Lowe.
"I’m still very, very single," Smith continued. "I think I’m even more single than I was when I released 'In the Lonely Hour,' so I’m insanely single."
"This album actually is not all about me," Smith said. "There’s about four songs that are about me, and the rest are about different things and different people in my life and what they’ve gone through."
"I wanted to welcome people back in and I want it to be about my voice and about the storytelling of something that I’ve gone through," the Oscar winner added.