"Rob wants to have a man to man chat with Rupert to find out exactly what happened between him and Kristen," an insider alleges to Radar Online. "Kristen has already betrayed his trust by cheating, so he can't be sure that she will tell him exactly what went on between her and Rupert. Rupert has a wife and a family to save, so Rob feels like he has nothing left to lose and would be honest with him."
While the logic of this scenario seems questionable, the source adds that R.Pattz is rapidly making his way through the five stages of grief.
"He was hurt and heartbroken, then angry and pissed off, and now he just wants answers," contends the snitch. "He feels like he needs to know exactly what happened, how far it went and how many times, so he can figure out if this is something he can move past. He's not ready to talk with Kristen. It's too painful, so he's going to Rupert."
Perhaps Rob should just send a message to the producer on Kristen's 2010 movie "Welcome to the Rileys," because he's spent much of the last week defending her on Twitter.
"The spin that keeps growing on this story is staggering," rails Giovanni Agnelli. "There was NO on set affair. Stop printing LIES."
When followers questioned his support of the actress, whose decision to cavort with Sanders in public was reckless at best and self-destructive at worst, he shot back, "Before tweeting me your hatred, know that she's like my little sister. I love her and will always defend her. Don't like it? Too [bleeping] bad."
Speaking of Stewart and Sanders being caught in flagrante delicto by an enterprising paparazzo, details on how the operation went down have emerged ...