Maybe I am too subjective but I do sense that you have a such strong loving heart. Yet we shouldn't trade our love between how much we receive and how much we give. Nevertheless, I don't think there is a such thing so called to give unlimitedly. Love from parents is great and unselfish in many many ways, but to mull over, it is really double sided. To expand, it can apply to all kinds of love.
Personally I beleive love has its own life same as us that needs to be nurturing. If it is only to give or to receive, it will fade and die very soon. Indeed I even think that love has its power over man's will - somehow it teaches us how to live a better life. But first of all we had better not afraid of its coming and going, afraid of losing ourselves, afraid of taking risks; we've got to believe no matter what happens, love will do good to our lives. Only so our lives could be fulfilled.....