Justin Theroux stayed in his guest house before separating from Jennifer Aniston.
The couple decided to split at the end of last year after two and a half years of marriage, and now is has been claimed the pair were living such separate lives in the final months of their relationship, they didn't even sleep under the same roof.
The source told Us Weekly: "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.
"He just felt more comfortable [in the guest house] than in the main house with Jen."
Neither the 46-year-old actor nor the former 'Friends' actress have spoken about the split since they released a joint statement on the end of their two-and-a-half-year marriage following increased speculation about the state of their marriage.
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.
"Normally we would do this privately, but given that the gossip industry cannot resist an opportunity to speculate and invent, we wanted to convey the truth directly. Whatever else is printed about us that is not directly from us, is someone else's fictional narrative. Above all, we are determined to maintain the deep respect and love that we have for one another."
Meanwhile, it was claimed their split was caused by the growing distance between the pair, as 49-year-old Jennifer spent her time in LA whilst Justin, 46, resided in New York.
A source said: "Jennifer is more comfortable in Los Angeles with her close-knit group of friends. But Justin doesn't feel as at home in LA, nor with Jennifer's friends, he loves New York, and the edgier crowd in the city.
"As they spent more and more time apart, their problems became bigger. He's very focused on himself and his craft. And Jen is not the easygoing girl she wants the public to think she is. She isn't as happy, and she is far more complicated."