Well that is one of the ugly sides of D....the money issues. He probably won't get a dime from the house (or you either) if there is no equity. Just the way the market is. Nobody's fault.
Seriously, I would go and file for D if for nothing else to protect yourself legally and financially. If something changes before the time is up and your H makes a huge change then so be it. But right now you are like a sitting duck waiting for a tragedy to happen.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!