Brittany Cartwright has had the “hardest year of [her] life” since splitting up with Jax Taylor. The 35-year-old reality star tied the knot with her ‘Vanderpump Rules’ co-star Jax, 45, in 2019 but she filed for divorce at the beginning of this year over “irreconcilable differences” and now she has insisted that she is just “trying to stay positive” despite the though time that she has had. She told PageSix: “It’s been very, very hard [and] probably the hardest year of my life. But, at the same time, I’m just trying to stay positive. I’m stepping into my own, so I feel a lot of strength, and a …