Reality star Lisa Vanderpump has been rumored to be leaving Real Housewives of Beverly Hills, and her co-star Brandi Glanville could be the primary reason why.

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Vanderpump spoke with E!'s Beyond Candid With Giuliana on Sunday where she said that Glanville has "been horrible" to her since they stopped being friends. According to the reality star, Glanville said awful things about her.

"I don't want to give it too much credence, it's just to keep deflecting, keep denying, and the fact is that once something is out there it can stick and that's upsetting," Vanderpump said, as published by Radar Online.

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"But I don't retaliate," she continued. "I mean I could throw every name out there, it's an easy target, but I'm not going to. There are some downsides and this season has been particularly difficult."

Vanderpump told Rancic before that if the series continues with more unnecessary drama, then she won't want to stick around.

"I just don't want any BS editing," she said. "I'm no angel, I do make a few snarky comments and have a laugh. It is a television show. But I'm not in this business or on this show to put down my cast mates or get into a b----fest, that's not who I am, and I think if that day comes then I should leave."

There is also a possibility that the other women could be jealous of Vanderpump's success with her other reality series Vanderpump Rules.

"I would like to think they're supportive," she said. "But I can't say honestly that they have been."