Jason Merritt / Getty Images North America 1 / 12
Jason Merritt / Getty Images North America 1 / 12

Another seemingly solid Hollywood couple called it quits this week when Naomi Watts and Liev Schreiber announced their 11-year romance had come to an end.

The news arrived without the rumors of relationship trouble that often precede such high-profile splits, but an insider tells E! News the breakup has "been a long time coming."

Adds a source to the New York Post, "They split because she wants to travel the world making movies and attending film festivals and red carpets, but he is a New Yorker and just wants to settle with their kids. Both are great parents and will do what is best for their kids. They get on so well that friends are saying they wouldn't be surprised if they got back together."

Liev admitted in June that it was difficult to navigate his family life with Naomi and their two sons in New York while he was in California shooting "Ray Donovan."

"This is the first time we did that," he told Ellen DeGeneres in an appearance on her show. "The kids are at that age where you kind of want them to have continuity with friends and school. You've got to put them first at a certain point and the back and forth, I think, can get tough," he said, adding that the situation is "hard on me most."

"I try to FaceTime with them but they're just bored," Liev continued. "It's a horrible feeling ... I work a 16-hour day and I have 20 minutes to talk to my kids and they're just like, 'Hey, Dad.'"

A few months earlier, Naomi told LA Confidential that she and Liev try to balance their work schedules so that only one parent stuck on set for long periods at a time, while the other can be home with their sons.

"Relationships are hard whether you're famous or not," she said at the time. "I don't know anyone who doesn't have to work on it. Being an actor doesn't change anything. I'm sure it's the same if you're a doctor or a couple of lawyers. You have high-pressure jobs, lots of hours, stresses that come at you unexpectedly -- and you have to figure out how to be present in the midst of it all."

Naomi and Liev recently attended the Toronto International Film Festival together, where they were photographed holding hands, according to E!. And while Naomi shared a sweet social media showing Liev and their son getting ready to attend the Emmy Awards, she did not join her then-partner for the event.

"They'll still be good friends and co-parents," says E!'s source, echoing the sentiments in the pair's joint statement about the split.

"Over the past few months we've come to the conclusion that the best way forward for us as a family is to separate as a couple," they told E! News on Monday. "It is with great love, respect, and friendship in our hearts that we look forward to raising our children together and exploring this new phase of our relationship."

They ended the statement with a request for the press "to be mindful of our children and respect their right to privacy."