Scott Disick and Kimberly Stewart have rekindled their relationship in recent months, though it's thought their romance is now putting a strain on Scott's friendship with Kimberly's brother Sean Stewart.
39-year-old Scott has been good friends with Sean for a number of years and it was the 42-year-old who actually introduced the Kardashians star to Kimberly.
Scott and Kimberly, 43, started hanging out as friends back in 2007, but were seen holding hands after enjoying a romantic dinner date in August this year.
Sources close to the stars have now claimed their relationship doesn't please everyone, explaining that Sean is scared Kimberly will hurt his pal.
"Sean is very protective of Scott. He probably is scared that Kimberly will break his heart," a source told Page Six.
They added that, despite public appearances, Kimberly and Sean "do not get along at all" and said Kimberly often "criticises" her brother.
"She bosses him around, yells at him and basically tries to tell him how to run his life," the insider added.
The Mirror has contacted representatives of Scott, Kimberly and Sean for comment.
Kimberly and Scott's relationship marks the TV personality's move away from his infamous age gap relationships, which have seen him date much younger women.
Following his decade-long relationship with Kourtney Kardashian, Scott dated high-profile young women such as Sofia Richie, now 23, and Amelia Hamlin, now 20 – who were both 19 when they first went out with Scott.
Bella Thorne, now 24, was also 19 when the pair started their short-lived romance.
Scott has discussed the trend on numerous occasions, even joking about the age gap between him and his exes on the new series of The Kardashians.
Khloe Kardashian suggested he would need to be with someone older than his past girlfriends if he wanted a "serious" relationship. Scott later said: "I think that’s a big step for me. But not over 30."
Kimberly and Scott previously sparked dating rumours in 2015 after his split with Kourtney, with whom he shares three children — Mason, 12, Penelope, 10, and Reign, eight. Kimberly also has a daughter Delilah del Toro, 10, with actor Benicio del Toro.
Kimberly's mum Alana denied speculation by saying they were just old friends.
"They [the Stewarts] introduced Scott to Kourtney. I was there when it happened, so I can tell you they're all great pals," she told People at the time.
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