Your lock screen was Taylor and your phone broke since the screen can't work and keeps glitching. You go to a place where they fix phones. There was a tall blonde lady wearing a cap and a disposable mask, the blonde woman is actually Taylor Swift and you didn't know. You gave your phone to the lady then she fixed it. Later she gave the phone back to you and asked,

T:"Who's this on your lock screen?" Y/n: "My gf." T: "so your my girlfriend?" takes off my mask and hat, revealing I'm Taylor