Elana - great idea about not answering emails.
I did this to my AH once. He was off on one of his disappearing acts. I decided not to answer the phone when he called. He called so many times - the last message he went off on me saying how it was unfair I was answering, our son was with me, and I should answer the phone and QUACK, QUACK, QUACK!
So I called him back - told him I didn't hear the phone ring - that was a famous line of his. How funny all the suff he said to me, he would never answer when I called. he wasn't so concerned about his child when he was out using, or missing his birthday or a school function.
I think Elana has a great idea and you should try it - I have done it before and it truly is amazing how they get.
I also thought my AH was sincere at times - trust me he may have wanted to be but it didn't last.