On Monday, Oct. 17, a former nanny to the ex-couple's two kids detailed what really happened behind closed doors, and she provided DailyMail.com with apparent text messages to back up the claims, one of which alleged that Jason threw himself under Olivia's car to keep her from seeing Harry.
Jason and Olivia, though, insist many of the claims are false.
The nanny, who seems to have been caught in the middle of the feuding duo, said Jason and Olivia's split was amicable in the early days, but things took a turn when she started seeing Harry.
The unnamed nanny said she never saw the duo fight until the "Booksmart" director met Harry on the set of "Don't Worry Darling." Soon after, the nanny said Olivia was spending more time on the set and moved into a hotel just before splitting with Jason.
"On the Monday morning November 9, when I came back from a weekend off he was crying a lot, crying and crying. I didn't know what had happened at all," the nanny said. "After I'd got the kids ready, Jason came upstairs and was having some coffee. He was crying and a mess, saying, 'She left us. She left us!'"
The nanny continued, "He was just out of control crying. I didn't know what to say. He was just crying and crying and saying he was going to get her back and he loved her. He was so brokenhearted – I felt for him. He started telling me details [of her relationship with Harry] and he said, 'She put the move on him. She put the first move on him. She kissed him at one of the dinners they had for the cast in Palm Springs. She did that.'"
The Emmy-winning actor reportedly discovered details of the Harry romance after seeing messages on an Apple watch that Olivia left behind while she was filming "Don't Worry Darling."
A few nights after apparently finding out the details of the romance, Jason allegedly became enraged when Olivia prepared a "special salad" for Harry… a salad that she only ever prepared for him and their children, Otis and Daisy.
"The night she left with her salad, Jason had chased after her, videotaping her in the house. She was saying, 'I'm scared of you, Jason, I'm scared of you.' And he said, 'If you're scared of me, why are you leaving your kids with me?' So then, Jason went outside and lay under her car so she wouldn't leave. She got in her car to back up, he lay under her car so she wouldn't leave," the nanny said. "She went back into the house and he went in, it was back and forth. He said he was doing it on purpose to make her late going to see Harry."
Recalling the conversation, the nanny remembered Jason telling her, "She made this salad and she made her special dressing and she's leaving with her salad to have dinner with [Harry]. I said, what salad dressing? He said, 'She has a special salad dressing she makes for us and she's taken it to have it with him now.' I don't know what was in it. Out of everything, he was like, 'She made her special salad dressing and took it to him.'"
The nanny said Jason and Olivia went to couple's therapy but nothing was ever resolved.
Although she claims Jason eventually fired her, the nanny has a soft spot for her former boss.
"I do have sympathy for Jason because I lived with him and saw him every day and we had a lot of good times. But the bad times were really bad," she said. "I feel for Jason because he really wanted to make things work, he tried. He left everything to go to therapy and to try harder to do better and it didn't work out."
Still, Jason and Olivia came together on Monday to slam the nanny, insisting many of the claims are untrue.
"As parents, it is incredibly upsetting to learn that a former nanny of our two young children would choose to make such false and scurrilous accusations about us publicly," the former couple said in a statement obtained by Page Six. "Her now 18 month long campaign of harassing us, as well as loved ones, close friends and colleagues, has reached its unfortunate apex. We will continue to focus on raising and protecting our children with the sincere hope that she will now choose to leave our family alone."