The telling lyrics: "And I'll tell you, baby, it was easy / Comin' back here to you once I figured it out / You were right here all along / It's like you're my mirror."
Who it's supposed to be about: Justin Timberlake's grandparents and Jessica Biel
Why? While the lyrics seem to reference Timberlake's marriage to Biel and the two becoming one, he also dedicated the music video to his grandparents, William and Sadie, who were married for more than 60 years.