"Out of the Woods"
The telling lyrics: "Your necklace hanging from my neck / The night we couldn't quite forget / When we decided / To move the furniture so we could dance / Baby, like we stood a chance / Two paper airplanes flying, flying . . . "
Who it's supposed to be about: Harry Styles
Why? Swift revealed the song's inspiration as "a relationship where I was kind of living day to day, wondering where it was going, if it was going to go anywhere, if it was going to end the next day," and BuzzFeed investigated the whole paper plane/necklace thing. Seems like the case is closed!