The Secret That Destroyed Demi Moore & Ashton Kutcher's Marriage (DETAILS)

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Ashton Kutcher & Demi Moore

Demi shows her excitement on a fishing trip with her man.

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Demi Moore and Ashton Kutcher's open marriage was the downfall of their relationship.

Yesterday we reported that after six years, Demi Moore has ended her marriage to Ashton with "great sadness and a heavy heart."

Now we are learning more about why the 49-year-old Margin Call actress called it quits. 

RadarOnline writes their “open marriage” has been much more twisted than anyone could imagine.

DETAILS: Demi Moore Calls IT Quits With Ashton Kutcher

“Everyone in Hollywood knows about their arrangement, but they’ve managed to keep it a secret from the general public,” an insider said about the A-list couple.

“Demi is attracted to women just as much as men, so she didn’t always get all she needed from Ashton.”

Apparently they were happy with the arrangement they had for a while.

“She was cool with Ashton having flirtatious relationships too. Somehow they made it work all these years. Both of them were respectful of each other,” the source said. “It was a lot of fun for them.”

DETAILS: Ashton Kutcher Sends Farewell Tweet To Demi Moore

It's pretty hard to believe it's over, but Ashton's first reported mistress Brittney Jones is saying 'I told you so.'

The sex tape star told TMZ: "For so long people have thought that I was dishonest or just making up my passionate nights with Ashton, when in fact I was being used.""Ashton told me that both he and Demi had an 'open relationship' and that he was not in fact cheating.  Now I can tell all the facts about how Ashton really was, and hopefully people will believe my side of the story." 

We're sad to see the end of a former seemingly solid Hollywood relationship and wish the best for all parties involved.