Though Harris hasn't spoken out about Swift's quick move on, Hollywood Life is claiming that Calvin supposedly now has his suspicions about Taylor's new romance after she was spotted dancing with Tom while she was still dating at the MET Gala in NY earlier this year.
In a tweet, Harris had said: "The only truth here is that a relationship came to an end & what remains is a huge amount of love and respect".
Rumors are Harris is now "pissed and feels betrayed" by Swift's speedy rebound.
"Taylor Swift x Tom Hiddleston (AKA "Hiddleswift" as my friends and I call this pairing), one-shot smut, split into five chapters", Jennifer summarized her fanfic, which was published on November 27, 2014, and completed on December 14, 2014.
Taylor, Kim Kardashian and Kanye recently became embroiled in a nasty war of words after Kim accused the singer of lying about not knowing she was going to feature on one of the rapper's tracks. Harris has unfollowed Swift on various platforms and deleted all pictures of the two together.
Taylor Swift has dedicated her award for Top Artist at the Billboard Awards to graduates.
Look who we spy staring longingly at Tom as he leaves a private event with Idris Elba. WEEKS before she split with Calvin
According to People magazine, Harris apparently wasn't aware of Swift's budding romance with Hiddleston.
The rumours that Taylor ended the relationship over the phone come eight years after the Shake It Off singer slammed her ex-boyfriend Joe Jonas for doing the very same thing.
Here's what we know about Tom and Taylor's saucy new romance!
"He is convinced that Taylor was cheating with Tom while they were still together", the source added.
And we also all know that unfollowing and deleting your ex on social media does not mean it's "all good".