On Monday, Taylor Swift premiered her new single during a live web chat with fans, sparking much speculation about who the song is about....We all know she writes songs about her ex's.

She said she was frustrated by rumors she was reuniting with a certain unnamed ex, she decided to set the record straight – publicly.

 “I was writing (in the studio)… and then this guy walks in, who was a friend of my ex’s, and he starts talking about how he’s heard that we were getting back together – and that was not the case.

“And so when he leaves, (Swift’s songwriting partner Max Martin) was like, ‘So what’s the story behind that?’ And so I start telling him this story of this break-up, get back together, break-up, get back together, just, ugh, the worst.

I picked up a guitar and Max said, ‘This is what we’re writing…’ It was so much fun.”