Over the past few weeks, the public has heard very little from Rob Kardashian, who deleted his social media accounts and started anew toward the end of May.
Rob hasn't spoken to his sisters since he booked it out of Florence the morning of Kim's wedding, prior to her exchanging vows with Kanye West.
The sock mogul "has no reason to talk to Kim,” the source told Radar, as “they haven’t been on good terms for a very long time."
This feud has been well-documented, as initial reports stated Rob left Europe because he and his sister clashed of his weight gain.
She allegedly thinks Rob's figure is giving the family a bad name, with one source stating Kim views Rob as "lazy."
But Khloe and Rob have always been close. The former posted a message to Instagram a few weeks ago that said she misses her best friend.
"Khloe has sent him text messages and left him several voice mails,” Radar writes. “Rob hasn’t returned any of Khloe’s phone calls or texts. He feels completely estranged from his sisters and family. He really isn’t in a good place."
Some say Rob is hooked on painkilers, while nearly everyone close to the star agrees that he wants out of the spotlight.
"Rob made the decision months ago that he didn’t want to have a recurring storyline on the upcoming season of Keeping Up With The Kardashians and drastically cut back on filming," the site reports.
Kris Jenner, meanwhile, is “extremely worried about” her son.
"She knows he isn’t in a good place, and is encouraging her kids to continue to reach out to Rob," the insider concludes.