By Louise Saunders
Their relationship was left in tatters when she was photographed cheating on him with married film director Rupert Sanders.
But Robert Pattinson and Kristen Stewart have reportedly decided to give their romance another shot.
The Twilight co-stars are said to have had a tearful heart-to-heart, with the 26-year-old actor eventually deciding to forgive his girlfriend for what he considers to be a 'stupid mistake'.
Reunited: Kristen Stewart and Robert Pattinson are said to have rekindled their romance after deciding they 'couldn't live without each other'
A source told The Sun: '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.'
The pair are now said to be moving into a secluded Los Angeles home together, and are hoping to rebuild their relationship.
The source added: 'Rob sees it as Kristen made a really stupid mistake. After a lot of long tearful talks, they've worked it out.
In happier times: Robert has reportedly forgiven Kristen for what he considers to be a 'stupid mistake'
'Rob can see how truly sorry Kristen is and has totally forgiven her. They really do love each other.'
Kristen seems to have been quietly confident about making amends with Rob for some time.
Earlier this month, she told reporters at a press conference the pair were 'totally fine' about making potentially awkward public appearances together in November while they promote The Twilight Saga: Breaking Dawn Part 2.
Back in July, Kristen was photographed in the arms of father-of-two Sanders, breaking not only the hearts of his wife Liberty Ross and her long-term love R-Patz - but loyal fans across the globe.
Scandal: Kristen was caught out having an affair with married director Rupert Sanders in July
In the wake of the news, both Kristen and Rupert were quick to make public statements saying that their tryst had been a mistake.
Kristen said: 'This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry.'
While Sanders told People magazine: 'I am utterly distraught about the pain I have caused my family. My beautiful wife and heavenly children are all I have in this world.
'I love them with all my heart. I am praying that we can get through this together.'
Lovers: Kristen was quick to admit her affair with married father-of-two Rupert was a mistake