Dear need sanity:
Greetings. No, technically he is not responsible for the monthly bills after he leaves (with the possible exception of the mortgage - since that is in both of your names).
My suggestion is that you obtain alimony from him to assist you with paying these expenses. No matter what you do agree to, get it in writing in the form of a properly executed separation agreement. You have a lot of rights which you are not apparently aware of, so I advise that you speak with an attorney. Good luck.
Janet L. Fritts
Attorney with Rosen Divorce
4101 Lake Boone Trail, Suite 500
Raleigh, North Carolina 27607
919.787.6668 main phone
919.256.1665 direct fax
10925 David Taylor Drive, Suite 100
Charlotte, North Carolina 28262
704.644.2831 main voice
704.307.4595 main fax
The response posted above is based upon the limited factual information made available and is not intended as a full and complete response to the question. The only reliable manner to obtain complete and adequate legal advice is to consult with an attorney, fully explain your situation, and allow the attorney sufficient opportunity to research the applicable law and facts required to render an accurate opinion. The basic information provided above is intended as a public service but a full discussion with an attorney should be undertaken before taking any action.