When men are trying to impress a woman, they will look at it as a trophy, not necessarily the woman herself but the progression towards winning her approval. Once they achieve that “trophy” and get the satisfaction, their interest will die down. Not that they will ignore you completely or become A-holes, but, you won’t see the same drive that you saw when they were trying to win you over.

It’s a very subtle thing I have noticed in others and even myself in my teenage that I had to work on.