Taylor Swift and Calvin Harris's relationship reportedly reached "breaking point" after he failed to acknowledge her input on his hit song This Is What You Came For.
The 26-year-old singer's involvement in Calvin and Rihanna's recent hit has long been rumored, after she was listed as a co-writer on the Wikipedia entry for the track before the entry was changed to Nils Sjoberg - believed to be Taylor's pseudonym.
However, TMZ.com have now claimed that disagreements over the track were the "breaking point" in Taylor and Calvin's relationship.
According to the outlet, when Taylor and Calvin were dating, the singer came up with the track and did a demo on her phone.
After sending it to Calvin, the pair are alleged to have hit the studio and laid down a full demo, with Taylor singing and Calvin behind the beat. While both parties are said to have realized the hit potential of the song, they apparently agreed that revealing they had collaborated would overshadow the song's release.
So Calvin recorded the hit with favored collaborator Rihanna, while Taylor reportedly kept the publishing rights under her pseudonym. But on the day of release, 29 April (16), when the DJ was interviewed on Ryan Seacrest's show, when asked if he would ever do a collaboration with Taylor, Calvin replied: "You know we haven't even spoken about it. I can't see it happening though."
TMZ allege that this was the "breaking point in the relationship", adding that "Taylor was hurt and felt Calvin took it too far".
Just days afterward, Taylor caused a media storm at The Met Gala when she was filmed dancing with The Night Manager star Tom Hiddleston, with whom she is now in a relationship.
While Taylor has moved on from Calvin, she has been a lot more generous than the Scottish superstar DJ, and doesn't appear to have any plans to prevent him from performing the song. Calvin famously wrote a song with his ex-girlfriend Rita Ora, and then banned her from performing it after they split.
Meanwhile, the website claim Taylor's camp are now reportedly revealing her involvement in the song because "they're sick of Calvin trashing Taylor and feel he should be thanking her for quietly giving him a smash hit."
WENN has reached out to Taylor's representative for comment.