My fiancee wants a polygamous relationship but I don't, what should I do?

He seemed like a very good person from the outside. We met last year and got engaged. But he told me last week that he wants a polygamous relationship I told my family but they told me not to break up with him. They said they would be disappointed if I broke up with him. Now my fiancee is quite happy. Wedding preparations continue at full speed He just smiles at everyone with his handsome face and acts like it's okay. What should I do?

My fiancee wants a polygamous relationship but I don't, what should I do?
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