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The A-list couple are said to have been secretly meeting up at their mutual friend Shannon Woodward's flat, despite calling time on their relationship earlier this year.
A source told Yahoo omg!: "Rob is still in love with Kristen and can't keep away from her. They've been meeting secretly at production studios and at Shannon's flat. The three of them have been close friends for years and all look out for each other."
Robert, 27, is reportedly finding it impossible to cut ties with Kristen - who was caught cheating on him with Snow White and the Huntsman director Rupert Sanders last summer - and doesn't want to move on from their four-year romance.
The insider added: "He's tried flirting with other girls, partying and putting distance between them but there's no other woman for him.
"His sister Lizzie has told him to follow his deepest feelings and to not by swayed by pressure from Hollywood, because his management and publicists want him to move on and leave his 'troubled' relationship with Kristen behind."
This comes after the Twilight stars were spotted checking into the plush Viceroy hotel in Palm Springs, California, with their pooches Bear and Bernie last month.
Since ending things with Kristen, 23, Robert has been linked to Sean Penn's daughter Dylan Penn, and enjoyed a brief romance with Elvis' granddaughter Riley Keough earlier this year.
