This was originally a song written in French with a different title but the same melodies. Vocalist Brendon Urie explained to Artist Direct
: "I got back from a vacation with my wife, Spencer (Smith, drums) and his girlfriend. We spent two days in London and four days in Paris. It was a week of vacationing, having good time, good food. We got back and I was trying to learn French, and slowly getting it, then started to lose it and got mad at myself. I wanted to write a song in French. I was singing in French, which was 'Marshmallow Heart,' and everyone heard it as 'Girl That You Love.' I had the song mapped out... singing in French."
"Then it became matching syllables to words in English," he continued. "That's how it got built, from French to English, with different meaning, but matching syllables."