Brad and Jen ended their five-year marriage in 2005 [Photo: Ron Galella Collection via Getty Images]

When Brad Pitt walked out on his marriage to Jennifer Aniston before shacking up with Angelina Jolie in 2005, Jen's heart was smashed into a thousand pieces.

Especially when it emerged that Angelina was pregnant with their first child, daughter Shiloh, now 13, before the ink was even dry on the divorce papers.

But amid rumours they're back together, during awards season Brad, 56, and Jennifer, 51, made it clear that whatever happened in the past is in the past, packing on the PDA on the SAG's red carpet where Brad gushed about his 'good friend' Jen.

And according to pals, the pair have 'realised what's important in life' and 'trust each other'.

Their road to recovery is said to have started when Brad apparently reached out to Jen following his 2016 divorce from Angelina and took the bold move of 'apologising' for his part in the split.

"Brad is in such a different place than he was when they were together. Brad is truly an introspective guy who has worked hard on himself," an insider told Entertainment Tonight.

Brad Pitt and Jennifer Aniston put on a cosy display at the SAG Awards in January [Photo: Getty Images for Turner]

"He has apologized to her for many things he felt were his issues in their relationship. He truly takes ownership of his mistakes and that has changed their relationship with each other today. They both have moved on.

"Right now they just love and adore each other and have been much closer friends since their divorces. Brad has grown so much in his life since he and Jen broke up."

However, his words apparently weren’t easy for Jen to hear.

After all, in 2005 when a Vanity Fair interviewer asked her about Angelina’s then-rumoured pregnancy, she cried silently for several minutes and was unable to answer.

“I have to think there’s some reason I have called this into my life,” she said of their separation. “I have to believe that - otherwise it’s just cruel.”

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She also shared her hurt over a W magazine shoot Brad and Angelina, 44, did titled Domestic Bliss which showed them as husband and wife surrounded by an army of mini-Brads just months after his split.

"Is it odd timing? Yeah. But it's not my life," she said at the time. "He makes his choices. He can do - whatever. We're divorced, and you can see why.

"Brad is not mean-spirited; he would never intentionally try to rub something in my face. But I know Brad. Brad would say, 'That's art!'... There's a sensitivity chip that’s missing."

Brad also took the rare step of issuing a public statement in 2011 after appearing to brand his marriage to Jen 'boring' in an interview with Parade magazine.

Brad Pitt and Jennifer Aniston put on a cosy display at the SAG Awards in January [Photo: Getty Images for Turner]

"I spent the '90s trying to hide out, trying to duck the full celebrity cacophony," he said.

"I started to get sick of myself sitting on a couch, holding a joint, hiding out. It started feeling pathetic. It became very clear to me that I was intent on trying to find a movie about an interesting life, but I wasn't living an interesting life myself.

"I think that my marriage had something to do with it. Trying to pretend the marriage was something that it wasn't."

He later apologised, insisting he was to blame for his own boredom and hailing his ex 'an incredibly giving, loving, and hilarious woman'.

Read Also:Brad Pitt gives Angelina Jolie 'divorce ultimatum'

He explained: "The point I was trying to make is not that Jen was dull, but that I was becoming dull to myself - and that, I am responsible for."

So when the 12 Monkeys actor reportedly met with Jen to apologise for everything that had gone before, a source told InTouch magazine it brought back a lot of old hurt.

“Jen was overcome with emotion. All the hurt feelings and resentment she’d suppressed for years came flooding to the surface, and she broke down in tears," claimed the insider.

“He apologized to Jen for being an absentee husband. He also made amends for leaving her Angelina,” the source added.