For two people who had tried to be so private with their romantic relationship, it was shocking that they made this spat so public. Not only did Taylor expose Calvin in the way that she actually took credit for writing the Scottish DJ's newest hit song but then he completely dragged her through the mud on Twitter. Bringing up everything from her now ex boyfriend, Tom Hiddleston, to her ongoing battle with Katy Perry – things were getting nasty!
Now, Calvin is opening up in the newest issue of British GQ about why he regrets calling out the "Bad Blood" singer. He confesses to lots and fans can't believe he said all of this about his past relationship!
Click through the gallery and let us know which one of Calvin's statements shocked you the most!