Taylor Swift Calvin Harris
Calvin Harris and Taylor Swift split after working on the track, This Is What You Came For Reuters

Calvin Harris was upset that Taylor Swift had written lyrics to his hit song, This Is What You Came For. The Bad Blood hitmaker had worked for the track under the pseudonym, Nils Sjoberg.

According to a report in The Sun, the Scottish DJ felt "emasculated" after it was revealed that Swift was a part of the music. A source said: "It was a secret that she wrote the song. The secret came out and her rep confirmed it and that p***ed him off. He went for the professional jugular with Rita Ora and it seems he's doing the same again." 

Adding on, Harris did not attend the Grammy Awards 2016 in February with Swift. The insider said: "There isn't a better award you can get than a Grammy Album of the Year. It's the ultimate accolade you can receive as a musician."

"If you're the kind of guy who doesn't want to stand by your woman on an important night like that then you'll also be the kind of guy that gets a bit p***ed off when your woman's getting toasted for the biggest track of your career for the past five years," the source dished.