Don't u know that i need u?

I don’t know either I am too weak or I can’t let a person down just because of I say NO..
It always happen to me..

Whenever I need someone so badly, the person won’t be there for me..
But, seldomly if someone need me, I say NO to that particular person..

What can I say, what can I do?
This is all beyond my control..
*sigh*

Don’t u know that I need u????