"I'm glad that he is finally taking care of himself and sober," the "Good as Gold" singer tells PEOPLE of her ex-castmate revealing he's more than 80 days sober

Cartwright and Taylor share a 3-year-old son, Cruz, from their four-year marriage. “Jax has caused an enormous amount of damage and I have very little trust in him at this point,” Cartwright concluded. “My only hope is that one day, he will be a better person for his son.”