Lor, I am so sorry for what you're going through right now. I know this doesn't make you feel better at the moment, but better that it happened at this point than down the line when there are kids, mortgages, etc. involved. I have a friend who just told our group last week that she's getting divorced (which sadly, didn't surprise any of us). She and her soon-to-be-ex-husband had many problems/issues before they got hitched, but she glossed over them thinking things would change and got married anyway and now its going to be a very bitter divorce. I realize you may not see it this way at the moment, but you have probably avoided a much bigger heartache with it ending now. I hope you'll be ok.
As for the legal issue about getting him to pay his share - if you want to, send me a PM with the details and I'll try to help you out as best I can.
I'm crossing my fingers for you.

Dear, sweet Harley Kwink...I'm madly in love with you. Marry me! We can go to Canadia. Or Boston or something. It'll be grand...You know the cookies are a given. They are ALWAYS a given. You could dump me tomorrow and you'd still get the cookies. Boston..shit, wherever dyke weddings were legalized. And where better to rub their little piggie noses in how bad they suck than right on their doorstep? What are they gonna do? Be jealous of you? Stare furiously at your tah-tahs? Not willingly give you cookies, but instead begrudgingly give you their cookies? Woman, time to wake up to the powers you wield - Uschi