09:08 AM EDT 12/22/2014

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Gwyneth Paltrow Cover

Inside Gwyneth Paltrow and Chris Martin's 'On and Off' Marriage | Chris Martin, Gwyneth Paltrow

Gwyneth Paltrow and Chris Martin's Marriage Was 'Falling Apart,' Says Source

Originally posted 04/02/2014 08:00AM

Long before they announced their split and introduced the world to the term "conscious uncoupling,", Gwyneth Paltrow and Chris Martin were struggling to stay a couple.

In this week's cover story, several friends tell PEOPLE that the pair, who were married for 10 years, at times had an "open" relationship.

"They were physically separated and emotionally," says a Paltrow insider.

Adds a close friend of the 41-year-old actress: "They have been on and off for many years. The marriage was falling apart."

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