Being caring and giving in any or all relationships is important and everyone likes to be appreciated for it sometimes. Everyone needs respect reciprocated.
Unfortunately, these days when you give too much or care too much in relationships, be it family relationships, friends or any other, it makes people appreciate you less rather than more. The more you care and give, the more likely people think of you as a doormat who will do anything to please. You are taken for granted and not much respected. You are often the one people leave behind while they move on in life, the one left wondering what went wrong.
I am not saying giving and caring in a relationship is bad. But doing too much of either will lead to you being alone. But then, how much is too much ?