When we give Love, we demand nothing in return. Love is its own delight and its own reward: Each time that we love, we are rewarded immediately; a burst of healing energy rushes throughout the brainbody system. This is often subtle, even undetectable; but these add up and, in time, bring the mind, body, and Soul into harmony. For Love is what we were created to do, and it simply does not matter how people respond.
Jesus taught Love and ended up on a cross; other lovers of humanity have been persecuted and even driven away from their communities. Love is almost never rewarded by the "lower" nature of the earthly senses, or by the "material" world; its blessings are all internal, personal, and spiritual. Love is always the right path, the correct response, to any situation.