I've lost you

I've given all that I can, and then given more
Yet you don't seem to care, my pain is easy to ignore
What did I do? What did I say?
What could I have done to make you act this way?
I tried everything to make you feel happy, and loved
I sacrificed my well-being, but I guess that wasn't enough
I can't keep this up, it's just to much to bear
Maybe when I'm gone, you'll understand how much I cared