Is it nasty to date someone who is your cousin cousin?

Yesterday I went to my uncles fight party. The girl I’m talking too right now come to find out is cousins with my cousin. We aren’t related by blood. My cousin is either my 2nd or 3rd cousin. My grandfathers aunt married her grandfather. Is it acceptable to date her because we aren’t related but we do have a mutual family member

Is it nasty to date someone who is your cousin cousin?
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