Songfacts®:

• The lead single from 5 Seconds of Summer's third album is a slick synthy tune that finds the guys reminiscing about an ex and wondering what went wrong.
  
  You know even when I say I've moved on
  You know even though I know that you're gone
  All I think about is where I went wrong
  Yeah I still dream of you
  
  "It's about wanting someone back" vocalist Luke Hemmings explained to Radio.com. "Or not even someone, even like the feeling of losing something and wanting it back, so it doesn't necessarily have to be about a particular person. It can be about a feeling you are trying to chase."
• The song was the last one penned for the 5SOS's third album and it came easily. "It was quite an organic procedure writing it, the process wasn't strenuous; it was very free flowing," bassist Calum Hood said. "It was actually the last song we wrote over the one and a half year process of writing the record, so it was very relieving to hit the jackpot at the end."
• In an interview with Beats 1, drummer Ashton Irwin explained why the guys chose to lead their third album with this track. "'Want You Back' articulates the band we were, we are now, and what we're gonna be," he said. "That's why I like it and that's why we picked it."