“She hired a private eye because she felt that he was fooling around with her on the set, and it turns out, he was. And that was the final straw,’’ the source said.
Pitt, 52, had been rumored to have been cozying up to his “Allied’’ co-star Marion Cotillard, 40, for months during the pair’s filming of the World War II drama in London.
The PI discovered that Pitt was cheating on his wife of two years with Cotillard — while also partying like a single guy on a mission, the source said.
“The atmosphere [off-set] was full of hard drugs and Russian hookers, and Angie was told Brad got caught up in it,’’ the source said.
“He’s in the throes of some insane midlife crisis, and Angie is fed up.”
But a source close to Cotillard denied the Pitt affair rumors and insisted she is still with her long-term partner, French actor and director Guillaume Canet.
“They are still very much together. They have been a couple since 2007 and have one child but have never married,’’ the source said of Cotillard and Canet.
The source could not confirm French reports that Cotillard is pregnant with her second child with Canet.
That's hot: Brad Pitt and Angelina Jolie were rumored to first connect on the set of their hit movie "Mrs. and Mrs. Smith" in 2005.
Photo: Everett Collection
Jolie and Pitt make a point to stand separately at the Los Angeles premiere of "Mr. and Mrs. Smith" on June 7, 2005.
Photo: Getty
Pitt and Jolie go public for the first time on a motorcycle ride in Edmonton, Canada, on Sept. 25, 2005.
Photo: Splash
Jolie, Pitt and kids Maddox and Zahara Jolie-Pitt land at Narita Airport in Tokyo on Nov. 27, 2005.
Photo: Getty
Pitt and a pregnant Jolie go on a U.N. goodwill trip to a school in Port-au-Prince, Haiti, on Jan. 13, 2006.
Photo: Splash
The jet-setting Jolie-Pitt clan touches down in Roissy Airport in Paris on March 4, 2006.
Photo: Splash
Pitt and Jolie attend a press conference in a Swakopmund, Namibia, hotel on June 7, 2006.
Photo: Getty
Jolie and Pitt escort Maddox and Zahara around Mumbai, India, on Nov. 12, 2006.
Photo: Getty
Pitt, Jolie, Maddox and Zahara Jolie-Pitt take a boat ride in Mumbai, India, on Nov. 18, 2006.
Photo: Getty
Pitt and Jolie ride motorcycles in Ho Chi Minh City, Vietnam, on Nov. 23, 2006.
Photo: Getty
Pitt and Jolie arrive at the Golden Globes on Jan. 15, 2007 in Beverly Hills.
Photo: Getty
Pitt and Jolie leave the "Ocean's Thirteen" premiere in Cannes on May 24, 2007.
Photo: Getty
Jolie supports Pitt at the premiere of "Ocean's Thirteen" in Hollywood on June 5, 2007.
Photo: Getty
Pitt and Jolie look as loved up as ever at the Venice Film Festival on Sept. 2, 2007.
Photo: Getty
Pitt and Jolie get close at the "Beowulf" London premiere on Nov. 11, 2007.
Photo: Getty
Jolie and Pitt are joyous at the Screen Actors Guild Awards on Jan. 27, 2008.
Photo: Getty
Jolie and Pitt leave the Independent Spirit Awards on Feb. 23, 2008.
Photo: Splash
Pitt and Jolie arrive at the "Kung Fu Panda" premiere at the Cannes Film Festival on May 15, 2008.
Photo: Getty
Pitt holds a pregnant Jolie at the Cannes Film Festival on May 20, 2008.
Photo: Getty
Jolie and Pitt chuckle at the Los Angeles premiere of "The Curious Case of Benjamin Button" on Dec. 8, 2008.
Photo: Getty
Jolie and Pitt stay close at the Critics' Choice Awards in Santa Monica, Calif., on Jan. 8, 2009.
Photo: Getty
Pitt and Jolie shine at the Golden Globes on Jan. 11, 2009 in Beverly Hills.
Photo: Getty
The couple coordinates at the Paris premiere of "The Curious Case of Benjamin Button" on Jan. 22, 2009.
Photo: Getty
Jolie and Pitt laugh at the Academy Awards in Los Angeles on Feb. 22, 2009.
Pitt and Jolie pose at the Cannes Film Festival on May 20, 2009.
Photo: Getty
Pitt and Jolie take their kids to see "Mary Poppins" on Broadway on Jan. 3, 2010.
Photo: Splash
Jolie clutches Pitt at the Hollywood premiere of "Salt" on July 19, 2010.
Photo: Getty
Pitt and Jolie attend the Rome premiere of "The Tourist" on Dec. 15, 2010.
Photo: Getty
Pitt and Jolie arrive at the Golden Globes on Jan. 16, 2011 in Beverly Hills.
Photo: Getty
Jolie and Pitt laugh at the Los Angeles premiere of "Kung Fu Panda 2" on May 22, 2011.
Photo: Getty
Pitt holds Jolie close at the Cannes Film Festival on May 16, 2011.
Photo: Getty
Pitt, Jolie and their brood arrive in Haneda Airport in Tokyo on Nov. 7, 2011.
Photo: Splash
Jolie, Pitt and the tykes land in Con Dao, Vietnam, on Nov. 11, 2011.
Photo: Getty
Jolie poses with Pitt and his parents at the New York premiere of "In the Land of Blood and Honey" on Dec. 5, 2011.
Photo: Getty
Pitt beams at Jolie at the Palm Springs International Film Festival on Jan. 7, 2012.
Photo: Getty
Jolie and Pitt arrive at the Golden Globes on Jan. 15, 2012 in Beverly Hills.
Photo: Getty
Pitt and Jolie joke at the Berlin premiere of "In the Land of Blood and Honey" on Feb. 11, 2012.
Photo: Getty
Pitt keeps his arm around his lady at the Cinema for Peace Gala on Feb. 13, 2012 in Berlin.
Photo: Getty
Pitt, Jolie and that infamous leg arrive at the Oscars on Feb. 26, 2012.
Photo: Getty
Jolie and Pitt attend the London premiere of "World War Z" on June 2, 2013.
Photo: Getty
Jolie supports Pitt at the Berlin premiere of "World War Z" on June 4, 2013.
Photo: Getty
Jolie and Pitt have a special guest at the Governors Awards on Nov. 16, 2013 in Hollywood: son Maddox.
Photo: Getty
Jolie and Pitt attend the British Academy Film Awards on Feb. 16 in London.
Photo: Getty
Jolie and Pitt attend the Academy Awards on March 2 in Hollywood.
Photo: Getty
Pitt and Jolie beam at one another at the "Maleficent" London premiere on May 8.
Photo: Getty
Pitt and Jolie share a smile at the Hollywood premiere of "Maleficent" on May 28.
Photo: Getty
Jolie, Pitt and their brood go for a stroll in the New Orleans French Quarter on March 20, 2011.
Photo: Splash
Jolie and Pitt attend the Global Summit To End Sexual Violence In Conflict in London on June 13, 2014.
Photo: Getty Images
Jolie and Pitt arrive at LAX with Zahara on June 14.
Photo: Splash
The pair attend the 15th Annual AFI Awards Luncheon on Jan. 9, 2015 in Beverly Hills, California.
Photo: Getty Images
The duo attend a screening of "By the Sea" on Nov. 3, 2015 in New York City.
Photo: Getty Images
Pitt, Jolie and Anna Wintour chat at the WSJ. Magazine 2015 Innovator Awards at the Museum of Modern Art on Nov. 4, 2015.
Photo: Getty Images
Jolie and Pitt attend the premiere of "By the Sea" during the AFI Fest on Nov. 5, 2015.
Photo: Getty Images
Jolie and Pitt attend a party for "By the Sea" on Nov. 5, 2015.
She has increasingly wanted to quit Hollywood in favor of devoting herself full-time to traveling the globe for her humanitarian work, while Pitt prefers Tinseltown and its parties, the source said.
Jolie spoke before the United Nations in Manhattan just this past Friday to ask them to help millions of Syrian refugees.
“The older she gets, the more serious she becomes, and she is sick of the Hollywood thing,’’ the second source said.
“He wants to make movies. She doesn’t. It’s a fundamental difference. It’s how you live your life.’’
Making matters worse, Pitt is closer to Jolie’s famous actor dad, Jon Voight, than she is, the source said.
“Jon’s a Hollywood guy, and she’s been estranged. Brad hangs out with her father more than she does,’’ the source said.
Another source told TMZ that Jolie believes that her hubby’s drinking and pot-smoking is affecting their kids.
Add to that his “anger problem,” and the mom of six said enough is enough, the source told the website.
Jolie filed for divorce Monday, citing “irreconcilable differences.”
She is seeking physical custody of the couple’s kids, TMZ said. She doesn’t want Pitt to have joint physical custody, just joint legal custody. He would get visitation, according to her filing.
Jolie is not seeking spousal support, the website said.
Brangelina’s French chateau, Miraval — where the couple married in August 2014 — has been quietly on the market for a few months, and locals were told they were selling it because they are breaking up, a source told The Post.
Jolie has hired top gun Laura Wasser as her lawyer.
The court documents list the couple’s date of separation as Sept. 15, 2016.
The couple have been together since 2004.
A rep for Cotillard did not immediately get back to The Post.
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