I haven't read much of your stuff before, but I read this thread. Why are you worried about your anger? I know it's not great to stay angry, but if it helps you keep your focus on the business (and it is business now) at hand, use it. Do you honestly want more than a coparenting relationship with her? Would you take her back? As I read about the deposition and the subsequent exchanges, I think you are seeing the woman that she is. It's funny how they want you to forget the crap they pulled and throw little things back at you. My 1st wife was like that and even if I was single I'd never consider a relationship with her. So, do you still want her? If the answer is no, then do the bare minimum in terms of responding to her. I'd personally ignore any text that doesn't directly relate to your child and reply as little as possible. Like texting, "Yes", when she asked if you used it in Tahoe. Replying back after any further texts isn't necessary. What will she do if you go mostly dark (except for kid issues)? Divorce you again? Make up more stuff about you? You have nothing to lose by ignoring her.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer