"Why have you choosen to stay so long with someone that is so emotionally unavailable for you"
That IS the $64,000 question.
Hey, I'm continuing to be dazzled by your therapist. I've been in LOTS of therapy and I don't think I've ever encountered someone who tackles something head-on like that.
RE your H changing his phone number: you need to make sure that part B of that is that he cannot call her and give her the new number. Your H sounds like the type that would say, "Well, I changed my number like you wanted! You never told me I couldn't give her the new number! You're just never satisfied, are you?" You need to close every loophole.
BTW can you answer the $64,000 question? I can't...