Question: "What can I do about my husband spending a great deal of money on a girlfriend he is living with and incurring large amounts of debt?"
Answer: Laws vary from state-to-state and country-to-country regarding how a spouse can protect financial interests when the other spouse is incurring debts on joint credit cards.
In a “common law” state, you may be able to protect yourself from a spouse’s debt, but in a “community property” state, your assets and debt are normally united.”
The better part of wisdom would be to consult an attorney who specializes in family or consumer law to learn about your legal options within your area of residence.
“Plans are established by seeking advice … obtain guidance.”
(PROVERBS 20:18)