A source told E! News that Perry “played a role, as one of many reasons”, in the split.
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Katy Perry and Pattinson were photographed together after the MET Gala Costume Ball in New York, while Stewart walked alone on the red carpet.
It was recently reported that Stewart was “insecure” about his friendship with Perry.
“Katy was Kristen’s friend first, but she gets on with Rob brilliantly. It’s clear to everyone that Rob’s got a bit of a crush on Katy and she totally plays up to it,” a source told Heat magazine.
“They wouldn’t act on it, but it still makes Kristen feel insecure.”
The Twilight couple have dated on and off for three years, briefly separating when Stewart cheated with director Rupert Sanders last year.
Source:
http://tchadquarterly.com/katy-perry-was-allegedly-a-factor-in-the-rumored-split-of-robert-pattinson-and-kristen-stewart/