Kendall Jenner was reportedly upset to see Justin Bieber flirting with other women earlier this week: Is their "friends with benefits" relationship over now?

Last month, HollywoodLife.com reported that the two, who have gotten closer since their racy photo shoot for Vogue's April 2015 issue, were enjoying their alleged "friends with benefits" status.

"They love telling people they're just friends, but they're playing with everyone -- there is more to it," an insider revealed. "They've hooked up in the past, and there's still something there."

Also, a source previously told In Touch that the couple always had feelings for each other but never took it to the next level, due to Jenner's friendship with Bieber's on-again, off-again girlfriend Selena Gomez.

However, Bieber was spotted "grinding" on model Josie Canseco at Nylon Midnight Garden Party on April 10 -- which Jenner was not happy about, according to another source.

The source alleged that the Canadian pop singer treated the "Keeping Up with the Kardashians" star "like a hanger-on" the following day.

"[Jenner] left crying, saying, 'Justin's a d----- bag,'" the source claimed, adding that Bieber even "brought girl after girl to his room" that night.

Similarly, HollywoodLife.com reported that the "Boyfriend" crooner was surrounded by a bunch of Victoria's Secret models at a Coachella after-party, flirting with most of the "newbies."

Bieber supposedly got cozy with VS Angel Irina Shayk in particular, as an insider said, "She was flirting with Justin all night."

However, another insider insisted that the reality star and the "Baby" hitmaker did not argue at all, explaining, "Kendall and Hailey [Baldwin] call Justin a douche bag all the time.

"That's how they flirt with him -- so maybe someone overheard that and misinterpreted it."