In my state you have to file through the courts for legal separation. But as far as food stamps, the county only counts the adults living in your household that bring in an income, so you only report your income if any, and any support he is paying to you. I was told that they would go after him if he was not paying child support but they never did. They're so overwhelmed with extra cases because of the economy that they just don't have the time. If he's not paying support, you may be able to go to the child support enforcement agency and fill out and application to have them start going after him. Good luck!