Relive 'Vanderpump Rules' Season 5 Reunion

"Rot in hell," a tearful Brittany Cartwright tells Jax Taylor.

On Monday's episode of "Vanderpump Rules," Jax Taylor finally admitted to girlfriend Brittany Cartwright that the rumors were true -- he did in fact sleep with Faith.

At Scheana Marie's masquerade birthday party last episode, Tom Sandoval confronted Jax about the rumor he heard that Jax had slept with the former SUR server. While Jax was vehemently denying the allegations to everyone within earshot, Faith was busy telling James Kennedy about the night she and Jax allegedly got busy -- and that she might be pregnant with his baby.

"So tell me the truth," an angry Brittany said to Jax as she packed her bags to visit a childhood friend in Las Vegas. "You did have sex with her?"

"Yes, it's true," Jax said. "Yes."

"Rot in hell," a tearful Brittany replied. "At least you can finally f-cking admit it. Why the f-ck would you do that?

"It was when we were going through bad times," Jax said.

"If you love someone, you don't do that no matter what the f-ck is happening!" Brittany yelled. "I didn't do that to you. I would never do that do you."

Jax told Bravo cams he and Brittany had been fighting for a long time, alluding to the weeks they spent in Kentucky on her family's farm filming "Jax and Brittany Take Kentucky."

"I didn't know she was going to say anything," Jax said, referring to Faith.

"I hope it was worth it," Brittany said.

Jax later told Bravo cams, "This isn't my first time being caught cheating. In my past, I've gone through months and months of deny, deny, deny, and that didn't work out for me."

Elsewhere, James, Sandoval, Ariana Madix and Tom Schwartz discussed Jax's infidelity.

"F-ck Jax," Ariana said. "Brittany deserves the world; at the very least, she deserves for her boyfriend not to f-ck her friends. It's not that hard."

"I know he didn't use a condom," James chimed in. "Last night, she told me she missed her period."

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