EXCLUSIVE: Christina El Moussa dating businessman, ex Tarek 'acting out,' source says

Christina El Moussa is off the market.

The 33-year-old Flip or Flop star is dating an Orange County businessman named Doug, a source close to the couple tells ET exclusively.

"It's new. They've been talking and seeing each other for a couple of weeks," the source says.

NEWS: Tarek and Christina El Moussa Attend Daytime Emmy Awards Together

"Christina and him recently reconnected," the source adds, sharing that the two have actually known one another for 10 years. "She dated him before her and Tarek were together."

ET has learned that Doug has met Christina and Tarek's two children, 6-year-old Taylor and 1-year-old Brayden. According to the source, Tarek isn't pleased with his estranged wife's new relationship.

See photos of Christina and Tarek El Moussa together:

18 PHOTOS
'Flip or Flop' couple Christina El Moussa and Tarek El Moussa together
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'Flip or Flop' couple Christina El Moussa and Tarek El Moussa together
PASADENA, CA - APRIL 30: TV Personalities Tarek El Moussa (L) and Christina El Moussa (R) attend the press room for the 44th annual Daytime Emmy Awards at Pasadena Civic Auditorium on April 30, 2017 in Pasadena, California. (Photo by Paul Archuleta/FilmMagic)
PASADENA, CA - APRIL 30: TV Personalities Tarek El Moussa (L) and Christina El Moussa (R) attend the press room for the 44th annual Daytime Emmy Awards at Pasadena Civic Auditorium on April 30, 2017 in Pasadena, California. (Photo by Paul Archuleta/FilmMagic)
PASADENA, CA - APRIL 30: Tarek El Moussa and Christina El Moussa present the award for outstanding entertainment news program at the 44th annual Daytime Emmy Awards at Pasadena Civic Auditorium on April 30, 2017 in Pasadena, California. (Photo by Michael Tullberg/Getty Images)
NEW YORK, NY - SEPTEMBER 15: Tarek El Moussa and Christina El Moussa attend Tarek and Christina, TV's Favorite House Flippers, Featured at TREND/Stone Source Event in New York on September 15, 2016 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 15: Tarek El Moussa and Christina El Moussa attend Tarek and Christina, TV's Favorite House Flippers, Featured at TREND/Stone Source Event in New York on September 15, 2016 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 15: Tarek El Moussa and Christina El Moussa attend Tarek and Christina, TV's Favorite House Flippers, Featured at TREND/Stone Source Event in New York on September 15, 2016 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
LAKEWOOD, CA - DECEMBER 13: Tarek and Christina El Moussa, hosts of HGTV's hit show Flip or Flop, visited the HGTV Santa HQ at Lakewood Center. The reality stars visited with Santa, toured the new digital Santa headquarters and celebrated the holidays with fans on December 13, 2014 in Lakewood, California. (Photo by Jerod Harris/Getty Images for Lakewood Center)
LAKEWOOD, CA - DECEMBER 13: Tarek and Christina El Moussa, hosts of HGTV's hit show Flip or Flop, visited the HGTV Santa HQ at Lakewood Center. The reality stars visited with Santa, toured the new digital Santa headquarters and celebrated the holidays with fans on December 13, 2014 in Lakewood, California. (Photo by Jerod Harris/Getty Images for Lakewood Center)
MIAMI BEACH, FL - MARCH 12: Jason Langford, Christina El Moussa & Tarek El Moussa of HGTV's 'Flip or Flop', new North American brand ambassadors, and Jamie Diaz attend the TREND Group and Granite Transformations global rebranding and ?Immense? product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI BEACH, FL - MARCH 12: Christina & Tarek El Moussa of HGTVâs âFlip or Flop,â new North American brand attend the TREND Group and Granite Transformations global rebranding and âImmenseâ product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI BEACH, FL - MARCH 12: Christina & Tarek El Moussa of HGTV's 'Flip or Flop', new North American brand ambassadors, attend the TREND Group and Granite Transformations global rebranding and âImmenseâ product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI BEACH, FL - MARCH 12: Kenya Moore of Bravo's 'The Real Housewives of Atlanta', Christina El Moussa and Tarek El Moussa of HGTV's 'Flip or Flop', new North American brand ambassadors, attend the TREND Group and Granite Transformations global rebranding and ?Immense? product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
TV hosts Tarek El Moussa , right, and his wife Christina El Moussa, second from right, talk during filming of HGTV's 'Flip or Flop' reality TV show as they discuss what to do with this recently purchase house in Whittier on July 19, 2013. The single story 3 bedroom, 1 bath, 1,112 sq. ft home was purchased for $275,000 cash in a short sale. They will put up to $40,000 into fixing it up and hope to sell for $350,00- $400,000. It came with a bonus room. It was discovered the bonus room had a bad foundation and was demolished. They also discovered mold between the walls. (Photo by Anne Cusack/Los Angeles Times via Getty Images)
ANAHEIM, CA - JULY 2, 2014: Husband and wife team Tarek,right, and Christina El Moussa help contractor Steve Cederquist pull down a terminate invested trellis in the backyard of a home during the filming of an episode of 'Flip or Flop' on July 2, 2014 in Anaheim, California. (Photo by Gina Ferazzi/Los Angeles Times via Getty Images)
LAKEWOOD, CA - DECEMBER 13: Tarek and Christina El Moussa, hosts of HGTV's hit show Flip or Flop, visited the HGTV Santa HQ at Lakewood Center. The reality stars visited with Santa, toured the new digital Santa headquarters and celebrated the holidays with fans on December 13, 2014 in Lakewood, California. (Photo by Jerod Harris/Getty Images for Lakewood Center)
MIAMI BEACH, FL - MARCH 12: Christina El Moussa of HGTV's 'Flip or Flop', new North American brand ambassador, attends the TREND Group and Granite Transformations global rebranding and âImmenseâ product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI BEACH, FL - MARCH 12: Christina El Moussa and Tarek El Moussa of HGTV's 'Flip or Flop', new North American brand ambassadors, attend the TREND Group and Granite Transformations global rebranding and âImmenseâ product collection launch event at Temple House on March 12, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
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"Tarek has always had a sense of jealousy over her prior relationship with this person," the source claims.

The source also claims that ever since Christina told Tarek about her new relationship, Tarek has been acting out. "He's been spending time with young, attractive women," the source claims.

"Tarek still can't move forward with the fact that Christina has moved on with her life and that she's truly happy with herself," the source also claims.

ET reached out to Tarek on Wednesday.

"I do not want Christina back nor am I jealous," he said.

ET has also reached out to Christina's rep.

WATCH: Christina El Moussa Flaunts Bikini Bod While Vacationing With Kids in Hawaii

There have been signs that the pair hasn't been as amicable lately as usual. Last month, Christina clapped back at Tarek for joking about their explosive fight a year ago.

Watch below:

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