Taylor Swift and Calvin Harris' once blossoming romance is now rumored to be "fading" quickly.

OK! Magazine reports the couple's sudden lack of PDA may be a sign Swift will be single again soon. A source later added, "Neither Calvin not Taylor has been showing each other any love on social media which is very telling."

Word is the two were experiencing turbulence in their once-whirlwind romance even before Harris was a no-show at last month's MTV Video Music Awards. Swift instead attended flanked by her army of well-known female pals.

"Taylor really thought she found Mr. Right with Calvin, but now she's questioning whether the last six months were a big lie," a source said. "This isn't just a bump in the road, this could be the end for them."

Reports are Harris has also been complaining about the "Bad Blood" singer spending so much time with her girlfriends, and he has grown more and more frustrated by her putting her friends before him.

"He wants to make it work with Taylor," a source added. "But he's made it clear that something needs to change."

With each day, the couple's impasse seems to grow steeper, with Swift's friends now reportedly telling her that if Harris can't understand the importance of their relationships, "she should be the one to dump him."

In recent times, Swift has also reportedly begun to take notice of Harris' short temper and all the recent Twitter feuds he's engaged in.

He recently exchanged heated tweets with Zayn Malik over his criticisms of Swift's decision to take her music off of Spotify. Harris also cursed out media outlets for "photoshopping fake tweets."

Sources indicate at first, Swift thought it was touching that he would so valiantly defend her honor. But now she just wishes he would learn to better control himself and realize that "public rants don't solve issues."