Today I heard Will Smith say that "you can't make a person happy" and I thought it was an interesting idea to reflect on. He says that "you can make a person smile, you can make a person feel good, you can make a person laugh but whether or not a person is happy is deeply and utterly out of your control."
Real love is unconditional. If it's real, you love a person no matter what, even if they don't love you back. Otherwise, it's your ego, your desire to be loved that drives you in that relationship. Too often, we find ourselves in situations when we require another person to love us, to give us attention, to give us gratitude, - and then it's not love anymore. Happiness in my interpretation is giving yourself fully to that person with whom you have a relationship.