Do not expect kindness from people. That is the best thing you can do to yourself. When you do good, do it without expecting it in return. It might not come from who you did the good to and it might not come when you desperately need an act of kindness in your life.
Giving comes at a price but this should not be something the giver should hold on to. Give without rancour,bitterness or anger. That is the way to give.

Thank you @ceepee