In the Amazon Music introduction for "Actually Romantic," Swift explains the lyrics for the song, which fans are convinced is about Charli xcx. She describes "Actually Romantic" as "a song about realizing that someone else has kind of had a one-sided, adversarial relationship with you that you didn’t know about." "And all of a sudden they start doing too much and they start letting you know that actually, you’ve been living in their head rent-free and you had no idea." Taylor Swift and Charli xcx in Toronto in October 2015. PeopleFor more on Taylor Swift, pick up PEOPLE's newly updated special edition Taylor Swift A to Z: A Showgirl's Life, out now.