Did Rob Pattinson Know About Kristen Stewart’s Fling With MovieProducer before magazine publication?

Is it possible that Robert Pattinson knew about Kristen Stewart‘s torrid love affair with married producer Rupert Sanders before it was blasted on a magazine cover for the world to see?

According to an insider, RPatz and KStew had the type of relationship that was based on a “100 percent honestly policy,” and they’d bothshared previous infidelities with each other, RadarOnline.com is exclusively reporting.

“When they were officially dating, they always had a policy of 100 percent honesty, which did create issues. Robert was always very frank about his flings with other women and that worked for Kristen too,” the pal revealed.

“They had an open relationship and it’s amazing that Kristen hasn’t revealed this info when she was being painted as a ‘jezebel’. Rob has had other women on the side and Kristen has had other women and men as well.”

In fact, the pal tells Radar that the couple took a “bizarre approach to relationships” and it was more business than romance.

“Their relationship was always a business and a spiritual partnership more than a romantic one. Rob and Kristen often said they might never see each other again after the last Twilight press tour and that’s pretty much what happened, except for their ‘are you in town’ booty calls,” the source said.

“They were pretty up-front with each other when they got sick and tired of each other. It was the strangest relationship, but keeping each other at arm’s length is working in their favor.”

And at arm’s length they are, because the source tells Radar that Pattinson and Stewart have continued to see each other on-and-off.

“Kristen and Rob are still close and definitely in contact,” the insider said, “and they still sleep together when the opportunity comes up.”

In July 2012 photographs were released of Stewart getting physical with her Snow White and the Huntsman director, Sanders — who was married at the time to Liberty Ross.