You just need to seal your menory when someone fade away from your life.
Meanwhile,you could smile and try to accept the kindness from others.
God will never treat you too rude to ruin your life.He definitely would left a hiden window for you if he delibrately close the easy-passing gate in front of you.
Anyway, to be nice as well as possible whoever you are encounter.Believe it, you'll get the greatest goodwill,honest, loyalty, and....love.