‘The Valley’ is set to expose the end of Brittany Cartwright and Jax Taylor’s marriage. The 35-year-old star and Jax, 45, announced their split earlier this year, and according to Us Weekly, season two of ‘The Valley’ will show the “explicit text messages” that Jax sent to another woman. An insider said: “[Jax] has been spending time with several different women who he meets at his bar or the gym, which is upsetting for those close to him because he isn’t focused on getting the help he needs. He can do what he wants, but of course it hurts Brittany.” Brittany – who has Cruz, three, with her es…