Previous reports claimed that Taylor was responsible for writing his smash-hit that's been topping the charts for the last nine weeks, "This Is What You Came Here For." And the reason their collaboration was kept so undercover was because they felt it would overshadow the actual song — so Taylor went with a pseudonym in the credits.
Responding to the claims, Calvin went on a Twitter rant hours later, admitting that Taylor was "an amazing lyric writer and she smashed it as usual." But then his feelings had a downward spiral from there, admitting that it was all her choice to keep their collaboration a major secret.