Selena Gomez apparently cannot let a rumor go that her former boyfriend hooked up with Miley Cyrus in 2010.

Is Miley Cyrus Getting Along With Patrick Schwarzenegger's Mother Maria Shriver?

Cyrus and Gomez both rose to fame on the Disney Channel at the same time and ever since they seem to have been pinned against each other.

Within the last few weeks, the two starlets have feuded on social media, in which Cyrus mocked Gomez by posing just like how she posed in a photo. 

Miley Cyrus & Selena Gomez's Latest Social Media Feud Reportedly Stems From Cody Simpson's Birthday Party

The feuding only continued with more mocking on Cyrus' part by mentioning Justin Bieber's hit song Beauty and a Beat since Nicki Minaj's rap mentions Gomez.

Gomez has responded to Cyrus' mocking and now it appears as though Gomez is holding a grudge over something that is completely false.

Hollywood Life reported Wednesday that Gomez is under the assumption that Cyrus hooked up with Bieber back in 2010, which was now about five years ago and she is still stewing over it.

A source revealed to the site that Cyrus and Bieber have a purely platonic relationship.

"Miley actually has never hooked up with Justin but she loves that Selena thinks she has," the source said.

"Miley does not see Justin that way, they're just friends, they're like family, but she's happy that Selena is threatened- anything she can do to get to her," the source added.

Back in 2010, the rumors swirled since Bieber and Cyrus were hanging out just as he and Gomez began their romantic relationship. Hollywood Life reported via Life & Style that a source revealed Gomez "forbid" Bieber from spending time with Cyrus.