Should I tell my sister's fiance that she is a criminal?

emiliad

My sis has done everything from repeatedly stealing money, to tax fraud, to plagiarising signatures on legal documents, defaulting on debt, cheating on her husband, crashing cars that weren't hers, to sleeping with married men, to dating people who have been to prison. Her ex boyfriends are in the triple digits and some of them got in a lot of trouble over the years because of her. She also slept w my ex husband. Needless to say we don't have a relationship but: She is very manipulative, an insanely good liar and very beautiful. Recently she brought home a "fiancé" who genuinely seems like a sweet guy who is currently very in love with her. I know it sounds terrible but should I tell him she is a very bad candidate for marriage? Is it only a matter of time before she ruins him too? Is it really none of my business? I feel kinda bad for him.

Should I tell my sister's fiance that she is a criminal?
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