Robert Pattinson has "totally forgiven" cheating Kristen Stewart after deciding they "couldn't live without each other".

The British actor was left heartbroken earlier this year when he found out about Kirsten's affair with married filmmaker Rupert Sanders.

The stars were sent into turmoil after it was revealed Kristen had been unfaithful, and while Robert initially refused to talk to the actress, he has now reportedly decided to give their highly-publicised relationship another go.

"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," a source told British newspaper The Sun.

"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."

Robert and Kristen are said to be moving into a secluded Los Angeles home together, and are hoping to rebuild their broken relationship.

The pair are due to step out to promote the final Twilight film Breaking Dawn - Part 2 in November, but sources insist they are "focusing on themselves for now".