Watch: Kyle Richards' Hubby Mauricio Accuses Lisa Vanderpump Of Exploiting Cheating Rumors

Kyle Richards and her husband, Mauricio Umansky, are fuming about their The Real Housewives of Beverly Hills  co-stars – who can’t seem to quit talking about the alleged cheating rumors.

In a new preview for the next episode of the hit Bravo show, Lisa Vanderpump’s speculation fosters acrimony as the couple discusses what they call the “biggest nightmare” of their lives.

“Lisa’s hurt my feelings now,” Richards confides to her husband, clearly referring to Vanderpump's comments about the rumors.

“She knows what we’ve been going through with all the lies and the tabloids," she vents.

"Then she makes a joke twice, one of the jokes in front of Portia."

Because Vanderpump has said numerous times that she doesn’t believe the gossip, Richards can’t understand why she keeps bringing it up.

“I think this is one of those situations where Lisa and Brandi Glanville have something to talk about against Kyle,” Umansky says to the camera. “They are having issues with Kyle, and they’re going to do their best to exploit that.”

The cheating rumors have played a huge storyline this season. During the season four premiere, Vanderpump put Richards on the spot, casually dropping allusions to stories about her husband’s alleged cheating  — with their daughter Portia in the room.

The frenemies were sitting in Richards' kitchen, engaging in what seemed to be innocuous small talk about tabloid rumors, when Vanderpump navigated the conversation toward uncomfortable areas.

She told Richards, “There’s all these nasty rumors about Mauricio,” later saying in a confessional interview she felt the best path to take, regarding the murmurs, was to address it head-on.

When Vanderpump pointedly alluded to Umansky about “so many rumors” in the tabloids, he shrugged it off and told Richards he was going to take their daughter Portia on some errands.

“This is where the rumor comes that he’s been seen with a younger woman,” Vanderpump said, causing Richards' anxiety to boil to the forefront.

“Would you stop that? I’m serious,” she told the British restaurateur, setting the stage for a season of tension yet to come.

The Real Housewives Of Beverly Hills airs on Bravo Mondays at 8/7c.