Inside Courteney Cox and David Arquette's Split

UPDATED 10/13/2010 at 11:00 AM EDT Originally published 10/13/2010 at 08:00 AM EDT

Inside Courteney Cox and David Arquette's Split
Courteney Cox
Shooting their movie Scream 4 this summer, things didn't seem right between Courteney Cox and David Arquette. The pair put on a united front for daughter Coco, 6, but often retreated to separate trailers between takes.

"It seemed like the worst-kept secret that things were weird between them," a set source tells PEOPLE in this week's cover story.

In the wake of their separation announcement this week – and Arquette's recent revelations about the couple's issues and their sex life to Howard Stern – friends of the famously mismatched pair say they always had differences but seemed to work through them.

Now, however, both Arquette, 39, and Cox, 46, are figuring out where to go from here.

"This was not an overnight thing," a source close to the pair says of their trial separation. "They needed to figure things out and try to find a happy place again."

For much more on this story, pick up this week's issue of PEOPLE, on newsstands Friday

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