Kristen Stewart and Robert Pattinson
Kristen Stewart and Robert Pattinson, also known as Robsten, pose playfully during a photo shoot.

Robert Pattinson wants to meet with Rupert Sanders, the man who was the object of affection for Pattinson's erstwhile girlfriend Kristen Stewart.

It's probably safe to assume the "Twilight" star has had a long week of being the subject of tabloid fodder after Stewart broke the news to him and now he wants to clear the air with Sanders to find out what really happened, according to Radar Online.

"Kristin 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," a source told Radar. "Rupert has a wife and family to save, so Rob feels like he has nothing left to lose and would be honest with him."

Pattinson, 26, allegedly feels twice as betrayed as he normally would have because of the amount of time Sanders spent with Stewart while he directed the star in "Snow White and the Huntsman." Stewart is 22, and Sanders, who has a wife and children, is 41.

Us Weekly posted photos this week of Stewart and Sanders hanging on each other and even making out in a car. Stewart even went so far as to wear Pattinson's famous Los Angeles Dodgers hat while she drove Sanders around.

"He's not ready to talk with Kristin, it's too painful, so he's going to Rupert. ... Rob just doesn't know who or what to believe right now," the source said.

Pattinson has had to deal with the most heartache in this situation, but he's not the only one mad about it. Actress Charlize Theron, who starred with Stewart in "Snow White and the Huntsman," is apparently furious with Sanders. Radar reported that Theron is a close friend of the director's wife and that she had no idea the illicit romance was heating up right under her nose.

Stewart and Sanders have both issued apologies since the news surfaced, but a source said Theron "felt like an older sister to Kristin, and they were always sharing advice." Theron also reportedly shared her adoption plans with Stewart.

News broke at the end of the week that Pattinson had moved out of the home he had shared with his "Twilight" co-star.

Stewart has said it was just a "momentary indiscretion" with the director, but more photographic evidence has surfaced that shows the two looking cozy all the way back in May. Pattinson will have a lot to ask about.