"In that moment they decided to make a fresh start. It was a 'come to Jesus meeting' that marked the beginning of a new phase in their relationship."
And the rumours the pair are getting back together will come as a surprise for friends and family who felt the Mr & Mrs Smith co-stars' marriage would never "recover", especially after Pitt's alleged verbal spat with their oldest child Maddox, 16, on a plane.
Halperin explained: "Angie was very, very angry about the incident on the private plane between Brad and Maddox, she threw everything she had at him.
"It was toxic. I've spoken to many people around them, friends and family, and no one could see how they could possibly recover."
However, the Lara Croft: Tomb Raider star and her Fury partner have realised they are much "happier" with one another than they are separated.
Halperin continued: "But both of them realise they are happier together than apart. Once they cleared the air between them, things started to improve.
"Today, they are both feeling very positive. Angelina sees them as very much the new [Richard] Burton and [Elizabeth] Taylor.
"They can't live together but they can't live apart. She has worked hard on herself since the plane incident, and so has Brad. They are still in love with each other."
However, their reunion doesn't mean the pair will call off their divorce, which they filed for last year, because they think once the case has been finalised they will have a "clean sheet" to build their partnership on.
Halperin said: "They both view divorce as not the worst thing that can happen.
"It's only a piece of paper and they feel once the divorce is done, they have a clean sheet and can start their lives anew."
- Bang! Showbiz