Justin Theroux quietly moved into Jennifer's Aniston's guest house as their marriage fell apart.
According to a new report, The Leftovers star, who maintains his own New York apartment, had always felt more comfortable in the separate smaller guest quarters of Jen's huge luxury Bel Air mansion.
As their relationship crumbled, he even took to sleeping in there.
A source told USWeekly: 'When Justin was in Los Angeles and staying with Jen, he would typically spend most of his time in the guest house of the mansion.
'He would play music, hang out and, in the final months of their marriage, would end up sleeping in the guest house.'
It has been claimed that a disagreement about where to live was the main cause of their split, with Jennifer preferring Los Angeles, while Justin opting for New York.
The two also kept their properties separate when they married.
According to property records obtained by The Blast, Jennifer, 49, and 46-year-old Justin kept the deeds to their residences in their own names and as their 'sole and separate property.'
In the eyes of the law, property acquired as a couple becomes community property but as the Cake actress already owned her 1965 Bel Air mansion - where she and Justin tied the knot - and her two-bedroom Hollywood Hills property, and the Leftovers star had his New York apartment in Greenwich village before they wed, and the deeds were never altered, it won't be an issue.
When it comes to finances, both stars had made most of their money before they got together, with Jennifer's hefty pay day from Friends and Justin's work on Tropic Thunder secured and not up for grabs during any potential settlement deals.
But division of assets may not even be an issue - after it emerged there was 'no evidence' the two ever officially married.
The former couple revealed last week that they decided to go their separate ways at the end of 2017, two and a half years after they tied the knot at Jen's Bel Air home.
But it has since emerged that there is no evidence a legal ceremony ever took place.
TMZ checked records in Los Angeles county as far back as 2010 and found no record of their marriage licence. The pair did not opt for a confidential marriage licence.
While it is possible that Jennifer, 49 and Justin, 46, filed their paperwork in a different county in Los Angeles, sources close to the pair insist this is not the case.
The pair announced their 'separation' earlier this week, in a joint statement.
They said: 'In an effort to reduce any further speculation, we have decided to announce our separation. This decision was mutual and lovingly made at the end of last year. We are two best friends who have decided to part ways as a couple, but look forward to continuing our cherished friendship.'
© Associated Newspapers Ltd.