Being 'needy' comes from needing valdiation, acceptance, approval, and reassurance, and constant attention from a female.
This is not a place we as mature, masculine Men want to be.
Look at ALL your interactions, esspecailly those of the romantic kind with females as you not needing to "get" anything from her, and not needing to 'take' anything from her.
Enjoy being with a woman, because as a Man, you simply enjoy being in the company of Women, not needing their approval of you, or constant attention.
When you have an abundance of confidence, self esteem, and a healthy lifestyle of your choosing , you will not need a woman to like you or validate you.
Hence, you let go of being needy or clingy in any way.
Ultimately if you are happy with yourself, and happy in your life, then obsessnig about what a woman thinks about an action you took, will not be of much importance to you. You simply won't 'obsess'.
Some peoplehave said a "Relationship is a bad place to get things from".
This mean, if you are independant, and self assured, you don't look at a relationship as a place to only 'get things from.
You can GIVE freely from your resources, and your partner is so caring, and appreciative of you,that she GIVES to you because she WANTS to, not becasse she feels guilty to do so.
Makes sense?
As far as actual behavior, well there are certain things like smiling too much, or trying to be TOO accomodating, or being too "nice", or placing her desires over yours ALL the time, or always giving her exactly waht she wants ALL the time, and just generally lower value body language and thinking.
A woman does not want to feel like she's your mother.
Or you have no life outside of her and your interactions with her.
I think the NUMBER ONE thing that will help most Males solve the undelrying problems like these are to really FOCUS on your Goals, and your Mission in Life.
You must have goals, and ambition.
If you don't , your relationships will fail 100% of the time. And you will eventualy regress into AFC behavior, and supress Masculine behavior.
Whenever you get fulfillment, and validation orom the hobbies, goals, interests, pursuits, and careers you choose, you are less NEEDY of it from Women.
When you achieve MORE and MORE Goals, you build up MORE and MORE SELF ESTEEM.
More Self Esteem, means more confidence.
Eventually, you are in a place where your life is positve, fulfilling, and has a purpose and meaning.
You won't ACT NEEDY , because you CANNOT BE NEEDY anymore.
Focus on your goals, and keep your masculinity as you focus on your mission in life.