Who would have thought that Jax Taylor would turn into a therapy advocate? On the Friday, September 6, episode of his and estranged wife Brittany Cartwright’s podcast “When Reality Hits,” the Vanderpump Rules alum, 45, raved over his recent 30-day stay at a mental health facility. “It was a very, very scary step for me, but it really needed to happen. It’s something I’ve been holding onto for many, many years,” began Taylor, who’s in the midst of a divorce from Cartwright. “I’ve known for years that there’s been something wrong but I just didn’t want to know. During my stay, I found out a lot …