"Liberty is not making this easy for Rupert, not surprisingly," an insider told RadarOnline.com. "Rupert is willing to do absolutely anything and everything he can to save his marriage, he realizes this is the worst mistake of his life, and he cannot believe he was so stupid.
"The thought of losing his wife and children, whom he loves more than anything in the world is killing him."
The parents-of-two have been thrust into the spotlight after Sanders' affair with his Snow White and the Huntsman star Stewart came to light. Kristen fessed up to the liaison shortly after pictures leaked of their clandestine meetings.
In related news, Pattinson will make his first post-scandal appearance on Comedy Central's The Daily Show on Monday, August 13 to promote his upcoming flick, Cosmopolis.
Pattinson is also scheduled to appear live on ABC’s Good Morning America next Wednesday.