Robert Pattinson feared Kristen Stewart was having secret affair for months

Robert Pattinson fears that Kristen Stewart’s affair with married film director Rupert Sanders might have gone on behind his back for months.

According to a friend, the 26-year-old actor is not sure if he could “get over this.

The Twilight actor, who has already quit the Los Angles mansion that he shared with Stewart, wants time alone to decide whether to make their current split permanent.

“He doesn’t know if he can move on. He feels humiliated and the wound will take a long time to heal, if at all,” the Mirror quoted a source as saying.

The 22-year-old actress has repeatedly insisted that her fling with the 41-year-old Brit movie maker was “a momentary indiscretion,” as she battles to save their three-year relationship.

But after new photos emerged showing both of them enjoying cosy dinner dates in Berlin and Los Angeles over several weeks, Pattinson “hit the roof,” and now believes that the pair may have been seeing each other since at least May.

“I can’t believe a word she says,” Pattinson said to a friend.