Songfacts®:

• The Fine Line album finds Harry Styles recalling the roller coaster of emotions he experienced when he found love, only for the relationship to end. This song, the title track, pieces together the push-pull of love and heartbreak that he sings of on the individual cuts.
  
  You've got my devotion
  But man, I can hate you sometimes
  
  Speaking during an interview on The Ellen DeGeneres Show, Harry explained: "When I was making this album, the times I was sad were among the saddest times of my life, but at the same time, the times when I was happy were some of the best times I've ever had in my life. So it's a fine line."
• After Harry repeats "we'll be a fine line" twelve times, the song fades into acceptance as he concludes, "We'll be alright."
• At 6:17, this sprawling track is the longest song on Fine Line. It builds from a softly strummed intro into an epic baroque number featuring marching drums, strings and an explosion of mariachi-like horns.
  
  Harry originally wrote the song as a simple folky ballad, but he explained to Rolling Stone it kept expanding and evolving. "It started simple, but I wanted to have this big epic outro thing," he said. "And it just took shape as this thing where I thought, 'That's just like the music I want to make.' I love strings, I love horns, I love harmonies - so why don't we just put all of that in there?"
• The Fine Line album debuted at #1 on the Billboard 200 chart with 478,000 equivalent units. That figure marked the biggest week for a pop album by a male artist since Justin Bieber's Purpose entered at the summit of the December 5, 2015-dated tally with 649,000 units.