Pattinson caught Stewart cheating on him with the married director last year.
“Rob broke up with Kristen because he never got over the fact that she cheated,” contactmusic.com quoted a source as saying.
“He is never going to forget. For a superstar, he can be very insecure and what went down last year just preyed on that.
Rob gets in his own head and thinks the worst. He broods a lot,” the source said.
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