Since he can't trust Kristen Stewart, the god of our sparkling vampire idolatry wants all the dirty deets from Rupert Sanders.
So while Kristen's distraught from Robert cutting off all contact with her, a source close to Robberz explains his next plan of action:
"Rob just doesn't know who or what to believe right now. And he'll do whatever it takes to find out the truth. Rob wants to have a man to man chat with Rupert to find out exactly what happened between him and Kristen. 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. Rob really was blindsided by this and he's going through the typical stages of being cheated on. He was hurt and heartbroken, then angry and pissed off, and now he just wants answers. 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."
Good for you, Rob! We stand behind you 110%! You do whatever you have to do!!