I know where you're coming from... recently I've started becoming more convinced that my W is in a MLC and not just a WAW. For some reason it has made a small difference to me. In the end she's still being, at times, cold-hearted and malicious. Though, I may choose to go with self-centered and narcissistic as descriptors instead.
I really don't know why it makes a difference to me, but it has in some small part. Maybe it's because I've come to believe that it isn't about feelings for some OM; it's just her profound dissatisfaction with her life which includes our R.
At the same time I also get more anxious at times... if she was just a WAW then changing myself and thus our R could be enough. But if my W is truly so dissatisfied with her life and her actions are because the R is something she can directly control (she can't not have kids, she can't jettison her family as examples, but she can jettison me) then I don't know that changing me and our R will be enough. Because I have no ability to effect those things beyond me.
So it's a double-edged sword.
Married 6 together 8 Me:38 W:31 second marriage for both SS12, SD10, S6 Bomb: 9/8/11 (day before our 5 yr ann) W moved out: 2/18/12 D final: 11/12/12 Share S 50/50. Spend as much time as I can with SS & SD