London, Jan ary 12: Robert Pattinson and Kristen Stewart's relationship is reportedly under strain once again.
The Twilight hunk is allegedly still struggling to forgive his co-star and girlfriend Kristen for cheating on him with her Snow White And The Huntsman director Rupert Sanders.
According to America's Life and Style magazine, the two can't stop fighting and friends fear they could be heading for another break-up.
"Things with them aren't good. They've been fighting a lot. Rob isn't happy. It's just a matter of time before he ends this," a source said. (ANI)