Los Angeles - Brad Pitt and Angelina Jolie were living in 'separate' parts of their home before their divorce.
The former couple, who split last week after 12 years together, are said to have been staying in different wings of their 80,000 sq ft Hollywood Hills estate before Jolie filed for divorce from The Big Short star last Monday.
A source close to Brad told Us Weekly magazine: "Angelina basically had her own wing and he had his. They began living these separate lives.
Their arguments progressively became more frequent."
Brad is said to have spoken to some of his pals about the pair's relationship while working on his forthcoming film Allied.
An insider added: "He said they've had rocky moments before, but this is the roughest patch they'd ever been through."
But a source close to the Tomb Raider star said: ''She cannot deal with anyone talking about their business.''
The pair - who have six children, Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and twins Knox and Vivienne, eight - are said to have signed a prenuptial agreement so it seems there shouldn't be too many issues dividing up their combined $400 million fortune.