A man's worth and how good he will be to you is not measured based on your paranoia about other females who are most likely nonexistent in his mind and eyes. It is only you who sees the women and then make his life miserable before he gets married to you. Think when he gets married to you then? LOL. Jealousy is insanity, it is the other side of love which is insanity itself anyway, an insanity people celebrate.
Such questions from a woman when I gave her no reason to ask is a red flag for me.
Stop being dramatic lol. This has nothing to do with jealousy. A woman has every right to know what kind of a man she's marrying! If I am talking to a potential spouse I will ask him what he thinks about polygamy, so I know ahead of time what I'm getting myself into. If you aren't into polygamy why would you be so bothered by the question? When a simple yes or no would suffice.