Following Kristen Stewart's shocking affair with director Rupert Sanders, speculation has begun over why she would cheat on boyfriend of three years and 'Twilight' co-star Robert Pattinson.

Sources close to the couple seem to be claiming that jealousy was the main reason that drove her into the arms of another man.
It seems that the 22 year-old has had to get used to girls throwing themselves at her man, and the fan envy that has grown ever since she was linked to the British hunk.
It seems that the 22 year-old has had to get used to girls throwing themselves at her man, and the fan envy that has grown ever since she was linked to the British hunk.
Kristen reportedly became uncontrollably jealous of Rob's close friendship with his 'Remember Me' co-star Emilie de Ravin. A source told HollywoodLife: “[Kristen] found it difficult to cope with Rob being close friends with another woman. As their friendship grew, she became more envious to the point that she would be very upset.
“They struck up their friendship when they were working away in New York and Kristen was still living in Los Angeles.”
However, unlike Kristen, Rob never strayed: “Nothing romantic ever happened between them, but it didn’t make Kristen feel any better about them being so close. They would socialize together away from the set too. They would spend their evenings together in bars and restaurants while they were in New York.”
But could jealousy really be the reason why Kristen cheated?
“They struck up their friendship when they were working away in New York and Kristen was still living in Los Angeles.”
However, unlike Kristen, Rob never strayed: “Nothing romantic ever happened between them, but it didn’t make Kristen feel any better about them being so close. They would socialize together away from the set too. They would spend their evenings together in bars and restaurants while they were in New York.”
But could jealousy really be the reason why Kristen cheated?

The actress has recently been named the highest paid actress in Hollywood has been talking more openly about her sexuality since moving on from 'Twilight'. She admitted in an interview earlier this year that she wished she was more sexually liberated and hinted that she wouldn't mind an open relationship.
Speaking of her character in 'On The Road' who is involved in a threesome, Kristen told Jalouse magazine: “I envy her.”
“She was a being that freed herself from the inhibition, she wasn’t someone who’s fearful. Her eyes are wide open when it comes to life, no judgements, she’s able to find the beauty in all of us.”
“She understood that jealousy had no meaning. She knew that her man was sleeping left and right and that his personality made him want to touch everyone,” Kristen added.
Speaking of her character in 'On The Road' who is involved in a threesome, Kristen told Jalouse magazine: “I envy her.”
“She was a being that freed herself from the inhibition, she wasn’t someone who’s fearful. Her eyes are wide open when it comes to life, no judgements, she’s able to find the beauty in all of us.”
“She understood that jealousy had no meaning. She knew that her man was sleeping left and right and that his personality made him want to touch everyone,” Kristen added.

































