why?

Why is it that when they are in need, i am always there catching them without saying any word. Why is it that when they failed to do there part i am always there, doing it. Why is it if they need my help, even though i am doing my own things, i pause for a while and help them without even thinking that they already eating the time i must spend for myself. And can somebody tell me that why is it when i am the one who's in need, failed to do my part, and in need with there help, they all ran away from me, leaving me hanging.

I thought, because i am showing them good deeds, good deeds too will be given to me in return. i was wrong. I know life is unfair, but do they even bother to think, just for a second, at least what i've done for them? It's so disappointing.