An insider said: "It was Eva who pushed for the move. She wanted to raise their daughters outside of Los Angeles and Ryan agreed. The problem is, he's restless and needs the action of a big city."
Montecito has its share of celebrities, but they apparently don't make up for the unique friend group Gosling enjoyed in L.A.
A source said: "Ryan loves adventure, and Eva has become an extremely private, paranoid person. They really are opposites in almost every way."
They also suggested Gosling hasn't adjusted to the quiet life – and probably won't anytime soon after luring the family to London to film his latest flick Project Hail Mary .
The insider added: "The family has spent hardly any time in Montecito this summer. That works well for Ryan, but it hasn't been great for putting down roots.
"Eva has more control in the relationship, and the kids keep them together."
A source after the Oscars: "People were surprised Eva wasn't by Ryan's side. It was a huge evening for him and she was nowhere to be found.
"Ryan and Eva don't like to go to events together, but the Oscars were different. It just goes to show how separate their lives are."
Another insider claimed Gosling and Mendes – who share daughters Esmeralda, 9, and Amada, 8 – are " hanging on by a thread " as they struggle with jealousy and fight over expanding their family.
The insider said: "Ryan has brought up having another child, but that led to another fight between them because Eva doesn't want to.
"Eva's decision on baby No.3 might be the final straw. They could break up over it."
It marked one of the first times the whole family was seen out and about together, and it was the first time Gosling and Mendes were seen together in public since they were spotted stepping out for a romantic dinner date in L.A. in September 2019.
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