Rob Kardashian is reportedly furious with Scott Disick.

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Following a nine-year relationship with Kourtney Kardashian, Disick reunited with his ex-girlfriend, stylist Chloe Bartoli, in South France, and now, Kourtney's younger brother, is reportedly having violent thoughts about what he'd like to do to Disick.

“Rob is really hurt by this entire situation," a source told Radar Online on Friday. “Scott was one of the only people that Rob could really turn to that understood what he was going through.”

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Kourtney split from Disick, whose she's starred alongside on Keeping Up With The Karadashians for the last several years, earlier this week after nine years and three childre, Mason, 5, Penelope, 3, and Reign, 6 months.

“Rob just cannot believe that Scott did this to his sister and her family and he says he really wants to knock Scott the f**k out," the source explained. "Scott has tried to reach out to Rob and get information out of him but Rob is not going to have any contact with him."

“Kourt and Khloe are really the only ones that Rob can stand and he loves Kourtney’s kids so much,” the source added. “Rob would do anything for those kids and he is their only uncle.”

Keeping Up With The Kardashians season 10 airs Sundays at 9 p.m. on the E! Network.

Tags: rob kardashian E! Reality TV Keeping Up With The Kardashians scott disick kourtney kardashian