According to Taylor, she actually wrote they lyrics to the song under a pseudonym, "Nils Sjöberg."
(Then, Calvin was taking too much credit for the song, and that's why ended the relationship, and then Calvin got mad and went on an epic Twitter rant against Tay, but that's a whole different story.)
But why did Taylor use that weird Nordic pseudonym in the first place?
No one's really sure, but, apparently, a real Nils Sjöberg does exist.
And unfortunately for him, he is getting swept up in all this celebrity drama despite being an innocent Communications Manager in Sweden.
Fans immediately began tweeting at him, thinking they had found Tay.
When he first realized what had happened, he wrote a Tumblr post about it complete with an adorable little illustration of Taylor deciding to use his name:
Nils wrote on the post,
@taylorswift uses my name (Nils Sjöberg) as an alias when she produce pop songs (it's true, google it!), one of my very own first world problems.
Luckily, the real Nils seems to have a sense of humor about the whole thing!
Though if I were him, I'm not so sure how I would feel about getting credit for these lyrics.
Love ya, Calvin and Tay!