This is just my thinking but if I was in your marriage I would either go for a legal sep, which would more than likey lead to a divorce, and for me it would be for the kids.

I think there is more damage being done to them now on how a marriage should be like, think of all the FOO issues that are being form right now?

Your marriage is the marriage your kids are going to gravitate to because this how they learn to relate to the opposite sex or learn what to expect of there mate.

I grew up with a crazy sister I think she is bi-polar or just plain evil, and you know who I picked as my mate a male version of my sister, because basically I was trained as young girl that I nor my opinions did not matter.

I'm all for saving marriages but some can not be saved by just one doing all the work why the other just sits on the couch like Al Bundy.

Whats to say that he is just waiting for the kids to graduate to walk out the door?

I have a question for you? Does he suffer from depression?
What does he do when he gets home from work? Does he interacts with the kids when they ask him to play games with them or does he just blows them off?