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It’s been a long and bumpy road for Tom Sandoval and Kristen Doute. Just when it looks like the (sometimes) lovebirds have finally put the past behind them, something happens to make them start fighting once again.

And as if Stassi Schroeder’s birthday getaway to Cabo wasn’t enough of a disaster already (thanks, Schwartz and Katie), Tom and Kristen get into once again over his rumored relationship with fellow SUR bartender, Ariana.

After suffering through another blowout fight in next week’s episode of Vanderpump Rules, Kristen finally can’t take it anymore. She calls Lisa Vanderpump and gives her a major ultimatum: it’s either her or Ariana.

“Some things are going down in Cabo between Tom and I regarding the Ariana situation,” Kristen explains on the phone. “I would love to [be enjoying Stassi’s birthday], but Jax’s big mouth is ruining it because he told Stassi last night that there’s truth to the cheating. I would prefer Ariana to not work at SUR at all. If that’s not a possibility, then I don’t think I can work at SUR anymore.”

Lisa makes it very clear that she’s not to be strong-armed, so Kristen could very well be out of a job. What’s more, she may be out of a relationship as well. “I can’t be with Tom,” she reveals. “I’m moving out.”

Watch this sneak peek from Vanderpump Rules Season 2, Episode 11, then make sure to tune in when it airs on Monday, January 13 on Bravo!