The singer delivered the tune during a private 7-song mini-concert at the Grammy Museum in Los Angeles on September 30 to celebrate the attendance record of the exhibit The Taylor Swift Experience.

"I'm going to play you a song," introduced Swift, "that 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. And it always felt like, 'Okay what's the next roadblock? What's the next thing that's gonna deter this? How long do we have before this turns into just an awful mess and we break up - is it a month, is it three days?'"

"And so I think a lot of relationships can be very solid and that's kind of what you hope for - solid and healthy - but that's not always what you get. And it doesn't mean that it's not special and extraordinary just to have a relationship that's fragile and somehow meaningful in that fragility."