"I'm going to play you a song I wrote about a relationship that I was in that the number one feeling I felt in the whole relationship was anxiety. Because it felt very fragile, it felt very tentative," Taylor said before performing the track for an intimate audience at the GRAMMY Museum.

"It always felt like 'What's the next road block? What's the next thing that's going to detour this? How long do we have before this turns into an awful mess and we break up? Is it a month? Is it three days?'"