I mainly just don't see the difference between living like this (alternating two houses together, sharing all expenses, etc) and staying married but just avoiding each other in one big house.
If you can't get along in a M because on spouse wants away that much, then how are you going to stay friendly and cooperative in this sort of tight intertwined relationship that has all of the challenges of M (paying bills, raising kids, getting along, etc) but none of the long term commitment. And if you can't stay friendly and cooperative, then how is it benefiting the kids?
It also seems like you are lying to the kids and pretending to them that you are still married? How will they react when they find out the truth?
Me 42, W 39, S8, S6, S2 M 11y, A & ILYBNILWY 11/08 Walking away from a bad situation.