He will slander her and you if you give him the chance.
A Godly husband protects his wife; a Godly man protects his sister.
If it is a man and they have read the Word they usually quote 1st Corinthians emphasizing the "seek not a wife" part with a pained look on there face.
If anyone can find anywhere in the Word of God that dating as we understand it today is scriptural I would like to see it. That does not mean you can't meet and get to know members of the opposite sex.
But for you men the Word is clear that you treat women with respect and as sisters. You don't decide you like her and drive off to Lookout Point even if she wants to. You don't want the girl that is willing to break her vow before God and you are doing the same.