How would I answer him, well we all agree that he is acting like a spoiled child and his behavior is completely inconsistent right???? So i would reply to him as I would to a child misbehaving.
I would let him know that you never said you didnt want to communicate. I would tell him when he is ready to commit to weekly calls to your kids maybe your kids would want to talk with him more. I would tell him that he needs to be consistent with the kids. I would remind him that they are the innocent bystanders in this and need to feel wanted and loved by him and he is not doing a very good job of that right now.
Your obligations and priorities right now are IMHO as follows....
1. Yourself mentally and physically 2. Your kid's well being. 3. Your home. 4. I don't know maybe Jello or TV... 5. Your husband.
You have every right to tell him what you need in support of raising your children and keeping them safe and feeling loved. His lack of communication and caring with them is uncalled for no matter what you and he are going through right now.
So my point I guess is this. You blasted out a line in the email that was a shot at him. That was what bothered me. It is beneath you and you acted out of anger. It gives him an excuse to put things off on you again. I would rather to have seen you hit him factually and requesting he live up to his paternal obligation.
You may need to refresh my memory on that number kiddo....