The pair reportedly agreed to a trial separation while the British actor films The Rover in Australia, and despite agreeing to no contact while he is away, the 23-year-old actress - who cheated on her Twilight Saga co-star with married director Rupert Sanders last summer - has penned her innermost feelings in a note to the hunky star in a bid to repair their fractured relationship.
A source told HollywoodLife.com: "Kristen wrote a long letter...explaining her love to Rob. Even if he can't forgive her, he should know that she is closer to him than anyone else could ever be."
It was previously claimed Kristen was planning to fly out to Australia in a desperate attempt to see Robert, 26.
A source said recently: "Kristen is desperate to get out to Australia because she misses Rob. But he's being ambivalent about the whole thing.
"It seems like she's going to fly out there, despite the fact that he has cut their communication down a lot. He's barely picking up her calls [or] responding to her messages."
However, after being advised against making the trip, Kristen decided to write the letter instead.