Can someone get a marriage annuled for fraud after being separated 7 years?

Question Details: My boyfriend married someone 7 years ago who said she had cancer that was terminal and wanted someone to adopt her kids so they could be handed over to her parents instead of their own biological fathers. He married her and found out 6 months later that she was faking chemo to make it look like she had cancer but didn't actually have it. They did an informal separation, and he thought that he couldnt get the marriage annulled in Iowa, so they are just leaving things as they are for now. Can he get it annulled now since she refuses to divorce him? Would he be responsible for her debts now?

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