A source said: "Rob was super-angry for the first couple of weeks. Angry at Kristen for ruining what they had, angry at her for the public embarrassment, angry at Rupert.
"But he's starting to wind down and really think about what he's going to do regarding his relationship with Kristen. He goes back and forth..."
The 26-year-old star has consulted his friends for advice on what he should do next regarding Kristen, 22, but their conflicting opinions have just left him more confused than before.
The insider explained to RadarOnline.com: "There's definitely some friends who think he should just move on from Kristen, but then there are others who still think Rob and Kristen really have a special connection and want him to give her another chance.
"He has a lot to think about and hasn't decided either way right now."
Robert is to make his first public appearance since the scandal broke when he appears on 'The Daily Show' on Monday to promote his new film 'Cosmopolis' and friends say he is "frazzled" at the idea of being asked personal questions.
The friend said: "Rob's always been a bit of an awkward nervous guy, but his appearances in New York next week have him frazzled.
"He's keen on promoting his new movie, but he really doesn't want to address his personal life or the cheating scandal because he's just not ready yet and doesn't want to say anything he'd regret."