BRAD PITT stormed out of a Berlin restaurant in tears after a bitter fight with ANGELINA JOLIE over her plans to reunite with ex-hubby BILLY BOB THORNTON.

The “Moneyball” actor had flown to Germany to be by An­gelina’s side at the Feb. 11 premiere of her critically acclaimed directo­rial debut, “In the Land of Blood and Honey,” at the Berlin International Film Festival. But Brad blew up when he learned that Angelina was planning to meet up with Billy Bob, whose film “Jayne Mansfield’s Car” was also debuting at the event.

According to sources, Angelina had contacted Billy Bob – her second husband – under the pretext of con­gratulating him on the film, but then asked if they could get together. He agreed to meet, and the two “began talking on the phone and e-mailing behind Brad’s back,” revealed an in­sider. After the premiere of her movie, Angelina and Brad dined at Berlin’s Zosimo restaurant, where she admit­ted how excited she was about seeing Billy Bob again, revealed a friend.

“Brad flipped out,” the friend con­tinued. “First he said, ‘No, you can’t!’

“But Angie laughed in his face and said, ‘Oh, yes I can…and I AM.’

“Brad is shattered and feels totally betrayed. He had flown to Berlin specifically to be by Angie’s side to support her and her film. He was so upset and caught off guard that she could be so cruel that he ran off in tears.”

The actor quickly packed his bags and  hightailed it to Lon­don, said the friend.

Angelina, 36, has long had a double standard when it comes to maintain­ing relationships with exes.

While she flaunts her friendly relations with former flames like Billy Bob and first husband Jonny Lee Miller, the actress “freaks out” if Brad so much as mentions any of his past romantic partners – particularly his ex-wife Jennifer Aniston.

“It’s completely un­fair,” said the source. “Brad has always put up with it because he loves her, but he’s not willing to do it any­more.”

Billy Bob, 56, whose three-year marriage to Angelina crumbled in 2003, twisted the knife even further when he raved about Ange­lina during a press conference in Berlin. “Angelina’s a wonderful woman and one of my best friends in the world,” he told reporters. “I’ll love her until the end of my life, and she’ll love me.”

Meanwhile, Angelina has admitted in the past that she still harbors feel­ings for Billy Bob.

“I still love him dearly and think the world of him,” she said in 2008. “I’m proud to have been his wife for a time.”