"Be kind to unkind people.. they need it the most." Reminds me of #JoyceMeyer "Hurting people, hurt people" - this can be one if the hardest things in life to do, but it can also be one of the most worthwhile.
Wise words that too few follow. People don't change, so move on to something better, otherwise you waste your life hoping beyond hope for someone who is not worthy of you. A bad seed will never grow or produce anything of value. Words to some of my students and friends.