Jax Taylor and Brittany Cartwright. Chelsea Guglielmino/Getty Images After raising eyebrows for their social media activity, Jax Taylor and Brittany Cartwright are alluding to ups and downs in their marriage. “I think that we will have to address some rumors — just a little bit. I’m not going to go too hard on this because, you know, some people do deserve to have their privacy. But I will say — marriage is hard and people go through ups and dow…