I think with you going completely dark it will give him something to think about. That you're not always going to be there for him. However, while you're going dark do not do it out of anger. Do it because you want him to have space. Ignoring him would not be ideal. It will only make him angry and he'll have one more reason why he doesn't want to be with you. Still respond but only short answers and leave it at that.
If he is offering information to you, like he starts telling you about things that are going on in his life, then continue on with short responses. Do not get caught up in wanting to talk to him all about it just because you so desperately want to talk to him. I think you will see results with this one way or the other.
And remember to celebrate your small victories and be proud of yourself for coming as far as you have. Eventually, you'll be so adamant that what you're doing is best that you won't have the desire to contact him anymore. And if you do, just keep posting here. That is what helped me the most.
I feel a little ridiculous giving you this advice with you knowing what I've been going through, however, I do know that my DBing efforts is what gave my H the change of heart that he needed. Now I just need to find a way to work through his infidelity.
Me: 32 H: 32 M 9 yrs #1 D7 #2 S5 #3 D2 Bomb 8/12/11 H moved out 8/14/11 PA started w/H & OW in 1/12 - found out 3/24/12 Got my own place 8/25/12 H & OW move in together 9/15/12 Still married.