If I were your atty, I'd have a field day if I had something from your husband -- in writing -- telling you to intentionally NOT pay the mortgage, and that indicates his clear understanding that his cutting your $$$ in half would basically have that result.
Deciding to do the "strategic default" thing has its own interesting legal, financial and moral implications, but it's RECKLESS to consider it when the property in question is the primary residence of minor children. Even though the foreclosure dockets move slowly these days -- especially in states like Florida that are "judicial" states -- you're still playing the children as pawns if you decide to strategically default.