London, Sep 16 :  Actor Robert Pattinson has reportedly re-united with ex-girlfriend Kristen Stewart after realising that he can't live without her.

The 26-year-old, who was left devastated after discovering his girlfriend of four years had cheated on him with director Rupert Sander, has decided to give the actress another chance.

"They pretty much decided they couldn't live without each other. Kristen poured her heart out to Robert and told him it was a one-off and a mistake," femalefirst.co.uk quoted a source as saying.

"Rob sees it as Kristen made a really stupid mistake. After a lot of long tearful talks, they've worked it out. Rob can see how truly sorry Kristen is and has totally forgiven her. They really do love each other," the source added.

© IANS