Vanderpump Rules alums Jax Taylor and Brittany Cartwright have separated after four years of marriage, RadarOnline.com has learned. Cartwright, 35, announced the news on their joint podcast When Reality Hits on Thursday after rumors began to swirl that the married duo were living apart. “Many of you guys have been asking me about Jax and I and our relationship,” she shared on the latest episode. “I just think it’s important to be real and honest with you guys because we’ve shared so much of our lives with you guys.” Cartwright seemed to hint that her marriage had been on the rocks for some tim…