Some people cannot help themselves from being ungrateful and take every gift as an opportunity to blame.
Often we give our time, money, love, food out of guilt or a narcissistic hope that a person will change because of an act of kindness. When the person doesn't respond in a manner we would like, we feel unfulfilled and resentful.
Love goes above and beyond this. Love sometimes looks and feels quite unlike Love. But it isn't feeling and it doesn't come from us.