This was the ticket.

It's hard to raise a family on one income this day and age. We had to make certain sacrifices so that my ex could stay at home with the kids. We never had the nicest house, or the fanciest clothes, or the newest cars. Only after she left me did she tell me that blatant materialism was important to her; that she wanted the new car and the beach house, and the white picket fence, and IKEA furniture.

Had I known that she was sold out on The American Dream (tm) like that, I would have suggested she needed to be working as well and the kids could go to public school.

But when she did go back to work, shortly before our breakup, I got reports from her employer that she was being excessively flirty with patients there at the chiro office... Fuuuuu...