Robert Pattinson has reportedly changed his phone number so Kristen Stewart can't contact him.

Stewart publicly apologised to Pattinson after it was revealed she had cheated on him with her Snow White and the Huntsman director Rupert Sanders.

Now its said Pattinson is refusing to talk to Stewart, according to the British edition of Grazia magazine.

"Kristen is in such a dark place right now," a source has told the magazine. "She's desperate to win Robert back but he's changed his cell (mobile) phone number and has told mutual friends to let her know that it is over between them. She can't sleep and has completely lost her appetite. She says she can't think about anything rationally."

Pattinson and Stewart met while they were shooting the Twilight franchise, the final film of which is out later this year.