"You wife needs to feel you walking away not a fallback and comfortable position. if you can't do it in the same house then make sure you have everything checked off legally, financially, with he girls and you are squared away emotionally. Seperation isn't the end."
Yep! Except you can't make her feel what you want her to.
It still seems to me you are moving out because you are hoping it might save your M even tho' you say its for you. Fact is you should not take at face value ANYTHING she says. What she is saying or not saying seems to be standard WAW or pre-WAW behavior. For example if she doesn't want a D why wouldn't she want to make the M better by trying MWD, Retro or whatever? She seems to have a nice cake eating fallback position that you have provided but you don't have a fallback. If your ploy backfires you'll be in dire straits financially and emotionally.
I suggest you study other cases where this sort of thing was done. Actually very few had the desired result. Separation does not mean the end of the road but it could easily accelerate your trip to the end of the road. And there's no real correlation between separation and giving her "space". I don't mean to hit you with a 2x4 instead I mean for you to cover your rear end before you take this step.
I'm no fan of 2nd marriages when there are minor kids and the other parent is still active in the kid's life. But apparently this is common practice; however, not in my book; seems very wrong to me whether its done by the WAS or the LBS.
