Thank you.
There’s a large majority of men who believe that chivalry is about as outdated as Mitt Romney’s “regular guy” act. That train of thought comes from the widespread belief that most women aren’t attracted to the nice guys.
With that being said, if you happen to find a unicorn nice guy, I’d advise you to show your appreciation of his gentlemanly qualities by occasionally saying thank you. If he pays for dinner, say thank you. If he opens a door for you, say thank you. If he compliments you on how beautiful you are, just say thank you. This is music to his ears, and actually encourages him to be more giving of himself in the long run.