Not everyone agrees with Brittany Cartwright’s decision to stay with her cheating boyfriend, Jax Taylor — especially not his mistress, Faith Stowers!

Former SUR employee Stowers ripped into Taylor’s girlfriend after she hopped back into the sack with her man after learning the truth about his unfaithful behavior.

“So Brittney threatens to stab me tonight on #pumprules but will sleep with cheating #JAX the day after he cheats,” Stowers wrote in an Instagram rant.

Stowers then threatened Cartwright in her post, writing: “Brittney now you know physically you are no match for me stop it. #twisted #dickmatised #snapoutofit.”

Taylor admitted to having sex with Stowers on a recent episode of Vanderpump Rules.

While Cartwright originally dumped him and called him “f**king disgusting,”

Taylor then bragged to his pals that they had more sex in the two days after she found out the truth than they had in the previous two months.

On this week’s episode, Cartwright accused Taylor of having sex with Stowers more than once, lying to him that Stowers was at her party confessing to the multiple hookups.

Cartwright then told Taylor she wasn’t telling the truth because if Stowers had been there in person, she would have stabbed her with a knife.

Cartwright ended up forgiving Taylor for his cheating and the two were trying to “make it work” after his affair.