Is it all your fault? NO! Is some of it your fault? Yes. I think that your first step needs to be to take a deep breath. Think very hard about how you talk to your children about this situation. The way that you handle this now will forever stay with them.
You seem to be filled with anger. I have a hard time forgiving, definitely forgetting also. I went to counseling and it helped me immensely. All those pent up feelings and grudges seem to spill out on the Dr and I was able to let go a little. I would definitely suggest it to anyone.
I also read in the life after divorce section. Sometimes it seems that divorce is quick and easy, but with kids, you are forever connected. If you both are willing to seek counseling, give it a shot. Don't worry about what face he has on. Either way, I think that you should go.