Husband should not be able to do so. I assume realtor should see wife living in the house. Notify realtor that you are the spouse. Most (if not all) will require spouse's signature on all paperwork.
I assume that you want your half of the equity in the home. If you are concerned about this, perhaps you need to consult with an attorney.
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You should definitely speak with an experienced family attorney in your area. I assume you're going thru a divorce (or are about to). An attorney can advise you as to how best to protect your rights in the community property and otherwise.
Best of luck.
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If you are concerned about this, you should do the followign things immediately:
file suit for divorce
request a temporary restraining order
serve your husband
file a Notice of Lis Pendens in the real estate records