Los Angeles, Jan 12: Actor Robert Pattinson and Kristen Stewart are reportedly on the verge of splitting again.

According to America's Life & Style magazine, the two can't stop fighting and friends fear they could be heading for a 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," showbizspy.com quoted a source as saying.

Their relationship previously hit a rocky patch when Stewart's intimate photos with "Snow White And The Huntsman" director Rupert Sanders became public. Stewart and Pattinson split, but they were back together again.

IANS