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"Are you sure you're ready?"
Translation: Coming from an unmarried acquaintance, this sort of question is likely a projection of their own fears -- they're not in a position to make a lifelong commitment, so it's hard to imagine that you could be.
Quick comeback: Exude confidence and leave no room for anyone to debate if you or your fiance is in any way unprepared for what you're getting into: "Absolutely! We are completely in love and ready to be together forever."