Kourtney Kardashian says Scott Disick was shocked to hear Younes Bendjima was her 'boyfriend'

Kourtney Kardashian had to break it to Scott Disick that she's in a serious relationship.

In a preview clip for Sunday's Keeping Up With the Kardashians, the mother of three reveals to her sister, Khloe Kardashian, that her ex-boyfriend called her in the middle of the night to talk about their dating lives. Kourtney is currently seeing 24-year-old model Younes Bendjima, while Scott is in a relationship with 19-year-old model Sofia Richie.

"Last night, Scott called me at, like, two in the morning, which he never calls me late at night," Kourtney tells Khloe. "He was just ranting, like, 'What are we doing in life? What are you doing? What am I doing?' And I go, 'But what are you doing?' And then he'll say, 'But what are you doing? Is it any better?'"

This is when the 38-year-old reality star decided to come clean about her relationship with Younes. "By the end of the conversation, I was just like, 'I have a boyfriend and he's 24 years old! It's not the craziest thing that's ever happened in the world!'"

According to Kourtney, Scott wasn't pleased with this response. "Then he was like, 'He's your boyfriend!' Then he hung up the phone."

Kourtney says she didn't call him back but instead "just went to bed."

"Cut the cord," Khloe responds to her sister's story.

Back when news broke over the summer of Kourtney's new romance, a source told ET that Scott, 34, was having a hard time seeing his ex-girlfriend with another man.

"It’s never an easy thing to watch someone you share three children with, and so many memories, move on with someone else," the source said, adding that Scott really doesn't know Younes. "Scott has had a hard time watching Kourtney move on while he is in the same place he’s been in for years. It’s been tough for him.”

Kourtney Kardashian out and about

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Kourtney Kardashian out and about
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Kourtney Kardashian out and about
LOS ANGELES, CA - JULY 26: Kourtney Kardashian is seen on July 26, 2017 in Los Angeles, California. (Photo by Hollywood To You/Star Max/GC Images)
LOS ANGELES, CA - JULY 07: Kourtney Kardashian is seen at LAX on July 07, 2017 in Los Angeles, California. (Photo by LAXPICS/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JUNE 30: Kourtney Kardashian is seen at LAX on June 30, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JUNE 16: Kourtney Kardashian is seen on June 16, 2017 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
MIAMI BEACH - JUNE 11: Kourtney Kardashian seen on the beach with her son, Reign Disick on June 11, 2017 in Miami, Florida. (Photo by MTMI/BuzzFoto via Getty Images)
CLEVELAND, OH - JUNE 09: TV personalities Kourtney Kardashian, Khloe Kardashian and Kris Jenner react in Game 4 of the 2017 NBA Finals between the Golden State Warriors and the Cleveland Cavaliers at Quicken Loans Arena on June 9, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jason Miller/Getty Images)
CANNES, FRANCE - MAY 24: Kourtney Kardashian and Younes Bendjima are spotted during the 70th annual Cannes Film Festival at on May 24, 2017 in Cannes, France. (Photo by J. Almasi/GC Images)
CANNES, FRANCE - MAY 21: Kourtney Kardashian attends a dinner hosted by Jamie Reuben & Michael Kives with Arnold Schwarzenegger to celebrate Jean-Michel Cousteau's 'Wonders Of The Sea' during the 70th International Cannes Film Festival at Villa Golden Gate on May 21, 2017 in Cannes, France. (Photo by David M Benett/Dave Benett/Getty Images)
CANNES, FRANCE - MAY 22: Kourtney Kardashian is spotted during the 70th annual Cannes Film Festival at on May 22, 2017 in Cannes, France. (Photo by J. Almasi/GC Images)
HOLLYWOOD, CA - APRIL 12: Kourtney Kardashian attends the premiere of Open Road Films' 'The Promise' on April 12, 2017 in Hollywood, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - APRIL 05: Kourtney Kardashian is seen on April 05, 2017 in Los Angeles, California. (Photo by BG001/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 30: Television personality Kourtney Kardashian is seen on March 30, 2017 in Los Angeles, California. (Photo by Hollywood To You/Star Max/GC Images)
LOS ANGELES, CA - MARCH 19: Kourtney Kardashian and Kris Jenner seen out and about on March 19, 2017 in Los Angeles, CA. (Photo by ADV/BuzzFoto via Getty Images)
LOS ANGELES, CA - FEBRUARY 11: Kourtney Kardashian arrives at the Pre-GRAMMY Gala and Salute to Industry Icons Honoring Debra Lee on February 11, 2017 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - FEBRUARY 07: Kourtney Kardashian is seen on February 07, 2017 in Los Angeles, California. (Photo by TSM/Bauer-Griffin/GC Images)
LOS ANGELES, CA - DECEMBER 13: Kourtney Kardashian is seen on December 13, 2016 in Los Angeles, California. (Photo by SMXRF/Star Max/GC Images)
NEW YORK, NY - NOVEMBER 21: hloe Kardashian and Kourtney Kardashian attend Gabrielle's Angel Foundation For Cancer Research Hosts Angel Ball 2016 on November 21, 2016 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Gabrielle's Angel Foundation)
LOS ANGELES, CA - NOVEMBER 04: Kourtney Kardashian is seen on November 04, 2016 in Los Angeles, California. (Photo by wowcelebritytv/Bauer-Griffin/GC Images)
WESTLAKE VILLAGE, CA - NOVEMBER 04: Kourtney Kardashian films an episode of Amazon's live stream fashion and beauty show 'Style Code Live' at Four Seasons Hotel on November 4, 2016 in Westlake Village, California. (Photo by John Sciulli/Getty Images for Amazon's Style Code Live )
LOS ANGELES, CA - NOVEMBER 02: Kourtney and Khloe Kardashian are seen on November 02, 2016 in Los Angeles, California. (Photo by BG008/Bauer-Griffin/GC Images)
WEST HOLLYWOOD, CA - OCTOBER 19: Tv personality Kourtney Kardashian attends Cocktail Party With Manuka Doctor Global Brand Ambassador Kourtney Kardashian at Gracias Madre on October 19, 2016 in West Hollywood, California. (Photo by Charley Gallay/Getty Images for Manuka Doctor)
PARIS, FRANCE - OCTOBER 02: Kim Kardashian and Kourtney Kardashian attend the private Dinner hosted by Surface Magazine And Azzedine Alaia Private Dinner as part of Paris Fashion Week Spring/Summer 2017on October 2, 2016 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images for Surface Magazine)
PARIS, FRANCE - OCTOBER 02: (L-R) Kim Kardashian West and Kourtney Kardashian arrive at the 'Alaia' showroom on October 2, 2016 in Paris, France. (Photo by Marc Piasecki/GC Images)
PARIS, FRANCE - OCTOBER 01: Kourtney Kardashian arrives at 'Kinugawa' a japanese restaurant on October 1, 2016 in Paris, France. (Photo by Pierre Suu/GC Images)
PARIS, FRANCE - SEPTEMBER 30: Kim Kardashian West, Ellen von Unwerth and Kourtney Kardashian attend Buro 24/7 Fashion Forward Initiative as part of Paris Fashion Week Womenswear Spring/Summer 2016 at Hotel Ritz on September 30, 2016 in Paris, France. (Photo by Jacopo Raule/Getty Images)
PARIS, FRANCE - SEPTEMBER 30: Corey Gamble and Kourtney Kardashian are seen on September 30, 2016 in Paris, France. (Photo by Marc Piasecki/GC Images)
PARIS, FRANCE - SEPTEMBER 29: (L-R) Kim Kardashian West, Kourtney Kardashian and Kanye West leave the 'Givenchy' office on September 29, 2016 in Paris, France. (Photo by Marc Piasecki/GC Images)
LOS ANGELES, CA - SEPTEMBER 28: Kourtney Kardashian is seen at LAX on September 28, 2016 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
MIAMI BEACH, FL - SEPTEMBER 17: Kourtney Kardashian is sighted on Miami Beach on September 17, 2016 in Miami Beach, Florida. (Photo by Steven Gonzalez/GC Images)
NEW YORK, NY - SEPTEMBER 11: (EXCLUSIVE COVERAGE) (L-R) North West, Penelope Disick, Kourtney Kardashian, Mason Disick and 'So You Think You Dance' Season 11 Winner Ricky Ubeda as 'Mr.Mistoffelees' visit 'Cats' on Broadway at The Neil Simon Theatre on September 11, 2016 in New York City. (Photo by Bruce Glikas/Bruce Glikas/Getty Images)
NEW YORK, NY - SEPTEMBER 09: TV personality Kourtney Kardashian attends Harper's BAZAAR Celebrates 'ICONS By Carine Roitfeld' at The Plaza Hotel on September 9, 2016 in New York City. (Photo by Michael Stewart/WireImage)
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