WW-I want to seperate. You move out. Me-I say I am not leaving. WW-Ok, since your not leaving, I am leaving with the girls. Me-Your not taking the girls. WW-I am not leaving with out the girls. Me-Your not taking the girls. WW- SHE TAKES THE GIRLS
OK, H4H, I finished that little scenario for you, but that's not a "Mexican standoff," that's a CAPITULATION if you let her leave with your daughters. DO NOT WAVER in your VERBAL and WRITTEN position to her that "I do NOT consent to you taking the girls out of their house."
This is what's known as a HARD BOUNDARY -- a "dealbreaker." Unless you fight with everything at your disposal to enforce it, it is not a boundary at all. I know what you're saying of "I don't want to put the kids in the middle of it," but your wife has ALREADY put them in the middle of it, and nothing short of your own total capituation is going to keep things calm.
Do you REALLY think it's in your kids' best interest to not only have their parents split up right now, but to also have to leave the home they've come to know???