Does a man send an ambiguous message to a woman and say ambiguous words, which shows that he has a good impression on this woman? Like this woman?

Not necessarily. There are two possibilities: first, he likes this woman very much and wants to make further exchanges and even contacts with her. Treat this woman wholeheartedly. Second, he is a playboy, just trying to trick or deceive this woman to see if she is stupid enough to be infatuated with him, so as to be obedient to him.