Even when we always treat others well, it hurts when they treat us badly in return. While it’s true that we shouldn’t expect good in return for our good deeds and should continue to treat others with kindness, it still feels unfair when others take advantage of our goodness and manipulate us in such situations.
Well said. Edit: I didn’t feel confident in claiming it’s easier and therefore weaker to do so by default; your clarification expresses the sentiment better.