Taylor Swift really is the mastermind behind Calvin Harris’ monster hit “This is What You Came For,” and their relationship went downhill because he disrespected her when the song was released.

Earlier it was alleged that it was just a fan rumor, coming to find out it is very true. During their relationship, Taylor wrote the hit song, sat down at a piano and did a demo into her iPhone. She sent it to Calvin, who loved it. They both went into a studio and did a full demo with Taylor on vocals and Calvin doing the beat.

They had confidence that the song would be popular, but they both agreed it was a bad idea to let the world know they collaborated as a couple, believing their relationship would overpower the song.

Taylor, who kept the publishing rights, used the pseudonym Nils Sjoberg on the credits.

Fast forward to April 29th. Calvin released the song with Rihanna and it became an instant hit. It’s been at #1 and #2 on the Dance/Electronic chart for 9 weeks, and is #5 on the Billboard 100.

The problem in the relationship came the day the song was released. Calvin appeared on Ryan Seacrest’s radio show and Ryan asked, “Will you do a collaboration with your girlfriend?” Calvin responded, “You know we haven’t even spoken about it. I can’t see it happening though.”