Kristen Stewart ‘Knew’ She Could Get Away With Cheating On Robert Pattinson

penpointreview.blogspot.com has found out exclusively why Kristen felt she could risk Rob's love. Read on for the inside scoop.

Kristen Stewart's well-documented affair with Rupert Sanders was quite a slap in the face to boyfriend Robert Pattinson, but Kristen is counting on Rob's devotion to her to let her off the hook.

A source reveals to penpointreview.com exclusively, "Kristen knew she could get away with something like this…based on Rob being p***y-whipped." The source explains that Rob, 26, has mostly chosen Kristen, 22, over his career because he's uncomfortable with superstardom, leading him to more indie films after the Twilight blockbusters.

"The only person he really trusts is Kristen," the source says, continuing, "He was, and is, her cheerleader." Poor Rob!

What do you think, Pen Point Review Readers? Are you surprised that Kristen felt like she could risk her love?