Similar situation here. Stay strong Bro and hang in there. If at the end of the day she leaves, you can have a clear conscience and at least say that you did everything you could do
M: 39 W: 39 Kids (3): S10; S8; D4 Married 14 years Togethor: 18 years Wife's Weird Behavior Started: 2nd Half of 2009 Bomb Dropped (about being "so done"): 2/17/10 Current Status: In counseling