Kanye West is allegedly jealous of Taylor Swift's success and her budding friendship with Jay Z and Beyonce. 

Female First claims the "Bound 2 " rapper "loses it" whenever he hears a Taylor Swift record playing and gets upset whenever anyone mentions Swift's musical success, Star Magazine reports, according to Hollywood Life. 

"There's just something about Taylor that sends Kanye into a rage. He just doesn't get why she's so successful," a source told Star. 

West specifically despises Swift's widely successful "Shake it Off" video that has garnered nearly eight times more views than his "Bound 2" video.

In addition to her success, West allegedly opposes the friendship and working relationship Swift has formed with Beyonce and Jay Z.

"Kanye doesn't see things over his ego very often -- if ever -- and he is upset that he isn't in the club with Taylor, Jay Z, Beyonce and JT," the source said.

Supposedly, Jay Z also makes it a point to not bring West around when he is with Swift.

Jay Z and Beyonce were last seen partying with Swift in New York earlier this month after the three went to Justin Timberlake's "20/20 Experience" concert at the Barclays center.

At the time, Entertainment Tonight reported Taylor Swift and Beyonce were spotted in the audience of Timberlake's concert dancing and singing along, as Timberlake and special guest Jay Z took the stage to perform their hit song, "Holy Grail." Swift was in attendance to celebrate her 25th birthday, and Beyonce attended to support her husband.

Following the concert, Swift posted an Instagram photo of herself partying with Timberlake, Beyonce, Jay Z and Sam Smith. Timberlake also tweeted a photo of himself performing with Jay Z at his concert.

Check out the photos below.

Kanye West was nowhere to be seen at the party or at the concert.