Robert Pattinson will never get over Kristen Stewart's affair with British director Rupert Sanders last year.
A source told Us Weekly magazine that the British actor broke up with the 23-year-old because he never got over the fact that she cheated him, Contactmusic reported.
The source said that he is never going to forget all that and 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 added.