You can’t “make” people happy, no matter how hard you try. Even if you gave them everything they wanted, they would still have something about which to complain. They may go from one “love”-relationship to another; you may buy them one house after another; and they still will not be satisfied. Buy them roses or diamonds or Jaguars, and such people will, for a while, be comfortable, but they will not be happy.
All the things I have mentioned are external to human beings. Not only will trying to “make” people happy “wear you out,” frustrating you “to no end,” but such attempts are “exercises in futility.” Nothing is really gained from them, except, perhaps, proving that you cannot make other people happy.
Therefore, you are not responsible for making other people happy, because “happiness is an inside job.” You will never, ever be able to make people happy! Happiness is something they must discover for themselves. They must do something about their unhappiness, in order to become happy. And they start that by taking a look inside their lives, within themselves, especially caring about the condition of their souls and their relationship with God.
The “key” to happiness, then, is not outside you. Rather, it is inside you, waiting to be discovered!