It was written by bassist Mark Hoppus, guitarist Tom DeLonge, and drummer Travis Barker, alongside engineer Aaron Rubin and songwriters Ryan Tedder and Nick Long.
[4][5] The mid-tempo tune[6] contains opens with a synthesizer riff,[7] played by engineer Kevin Bivona, that interpolates the Cure's 1985 single "Close to Me", earning its frontman Robert Smith a songwriting credit.
[8] Jon Blistein of Rolling Stone stated that "'Fell in Love' is a bit of jangly alterna-pop, the bright guitars paired with some effervescent synths.
Tom DeLonge and Mark Hoppus share vocal duties, reminiscing about those exciting, slightly stupid moments in an early relationship.
"[9] Tom Breihan of Stereogum, praised the song's sincerity and catchy quality, while observing DeLonge's famously "strange and singular accent.