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Unfortunately, because you are in California, which is a community property state, any debt that is taken on by your spouse is also considered your debt within a marriage. Thus, the only options you have are to either divorce or to move to a state that is not a community property state, so that all of his debt only stays his debt, even if you are married.
There are only 9 states in the United States that are community property:
Another option you have is to have a post-nuptial agreement drawn up that says that any debt that he acquires is only his debt and not both of your debts. A family attorney can draw one up for you so that if any creditors come after you for any debt, this document should protect you.