I apologize, I only read your first and last posts.
You are clearly a very good man. Your children are lucky to have you as their father. Given the length of time it has been, I would assume that you have done everything you could possibly do at this point to try and rebuild your marriage. Your wife either just doesn't recognize what a great husband she has and/or she has lost respect for you. Sometimes you don't know what you got till it's gone. That may or may not be the case with your wife.
I think you either have to give her a final ultimatum and/or just cut her loose altogether. I know that's a tough thing to hear. I've been married longer than you and I can't wrap my brain around having to do that with my wife if forced to. But you deserve to be happy and appreciated. Life is just too short. Just my 2 cents. Take care.
M: 41 W: 39 S: 11 S: 10 D: 4 1st contact w/OM: 1/19/09 EA began: 2/14/09 EA discovered: 3/1/09 I file for D 8/25/09 to protect myself _______________________________