How much effort do u need to put?

Ever wonder how much effort do u need to put in something before u get back the same amount as the outcome.
Or u will never.
Ur first priority doesn't mean it's his first.
Or it will never ever be his first.
I am getting tired.
Why do I feel exhausted.
Will there be one day when he says he gives up on me.
Why do I always feel I am not worth anything after the things I have done for him.
He doesn't seems to appreciate anything.
Not eight years ago, not now, not in the future.
:(