Jax Claims Kristen Doute and Brittany Cartwright Hooked up

Vanderpump Rule's star Jax  Taylor claims he caught  Kristen Doute going down on Brittany Cartwright. According to Bravo TV, Brittany denies they hooked up. Cartwright said she is angry her boyfriend is "starting rumors." Did Jax really see the women in bed together or is he making it all up?