you really need to check your state laws - there are many factors and differs from state to state. if he is absolutly refusing to help with the at least the mortgage you may need to file some sort of papers to protect yourself - if you are really worried do not wait until you are underwater. Cut what you can from your other bills - cell phones/cable etc...

you can typically get few advise from lawyers. Find a good one

LNG
Me - 37
H - 42
S - 19
D - 16
D - 14
M - 20 years
S - 1/11/2010
http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=1942142&page=1