Taylor Swift: Ex Declares War With Song About Cheating

Taylor Swift's ex-boyfriend said they had an "understanding" that their relationship wasn't to be used for song lyrics — but Calvin Harris seems to feel used now that Taylor's run off with Tom Hiddleston! The angry Scottish DJ has dropped a new track called "Olé" that's telling the story of a breakup from the point-of-view of the other man! Calvin isn't being coy, either. The track even starts with a reference to Tom's role as Loki in the "Thor" and "Avengers" film franchises!

"Low-key," begins the song, "you won't tell none of your friends about me" — before Calvin goes on with more personal details that might be drawn from his own public breakup!

"Low-key," begins the song, "you won't tell none of your friends about me" — before Calvin goes on with more personal details that might be drawn from his own public breakup!

The National ENQUIRER had the scoop when Tom and Taylor started dating after getting together at the NYC Met Gala this past May. That was a month before Taylor finally broke up with Calvin — caught by RadarOnline hiding away from his girlfriend at a seedy massage parlor!

"Olé" offers even more insight into what might be Taylor's cheating side: "You've hidden my name in your phone so you can call me to tell me you've been going through hell/Left him alone and you booked in a hotel."

The song also seemingly refers to the several months that Taylor and Calvin went out as a couple after Tom had stolen Taylor's heart: "I see online that you've begun to be/A good girl and take trips with your boyfriend/Being attentive, continue to pretend!"

It's the first blast in what could become a public pop-music war between the former lovers — and a big surprise from Calvin, who was originally low-key himself about the breakup.

"The only truth here is that a relationship came to an end & what remains is a huge amount of love and respect," said Calvin at the time — but that was before Taylor went public with Tom!