I've copied this part out of the book of Mark Manson. I was wondering you should not appear needy but if you don't do anything with the women nothing will happen right... What is exactly meant with it?

There are two ways for seduction to happen: 1) a man creates the perception that he is far less invested in her than he actually is (neediness disguised as non-neediness), and 2) a man actually is less invested in her (genuine non-neediness).