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Just last week we learned that Kristen Stewart had a “momentary indiscretion” when she cheated on her boyfriend Robert Pattinson with Rupert Sanders, the married director of her movie Snow White and the Huntsman. 

DETAILS: Robert Pattinson Left “Devastated” By Kristen Stewart’s Cheating

Once the news broke, KStew quickly issued an apology to Rob, saying, “I love you, I love you, I’m sorry.” Back then, reports surfaced that it was just a kiss that sparked the apology, but now we’re learning these two might have been hooking up for about a year. 

Leopold Ross, the brother of Rupert’s wife Liberty Ross, believes Kristen has been fooling around with his sister’s husband for a while. 

“It was from the last half of filming and all through post-production, clear into last week,” Leopold told People Magazine.

He also goes on to explain how upset Liberty was about the cheating, considering she moved with her kids from England to Hollywood to help Rupert’s career. 

“She made some sacrifices for something she thought was worth it, now she knows, right?” Leopold Ross said. “It might actually make things better in the long run. She wasn’t that happy for a while, but our family is close, she’ll be all right.”

Rupert also issued an apology, but it’s not clear if either relationship will be able to withstand this cheating scandal.

PHOTOS: UH OH! Kristen Stewart Cheated On Robert Pattinson With Married Movie Director! 

Rob allegedly moved out of the home he shared with Kristen Stewart and it’s unclear whether he will continue to carry on a relationship with his Twilight costar. 

SOURCE: NY Daily News