This is Love, http://www.yasminmogahed.com/2012/01/03/this-is-love/

“But if the person you marry becomes your ultimate focus in life, your struggle has just begun. Now your spouse will become your greatest test. Until you remove that person from the place in your heart that only God should be, it will keep hurting. Ironically, your spouse will become the tool for this painful extraction process, until you learn that there are places in the human heart made only by—and for—God.

Among the other lessons you may learn along this path—after a long road of loss, gain, failure, success, and so many mistakes—is that there are at least 2 types of love. There will be some people you love because of what you get from them: what they give you, the way they make you feel. This is perhaps the majority of love—which is also what makes much of love so unstable. A person’s capacity to give is inconstant and changing. Your response to what you are given is also inconstant and changing. So if you’re chasing a feeling, you’ll always be chasing.  No feeling is ever constant. If love is dependent on this, it too becomes inconstant and changing. And just like everything in this world, the more you chase it, the more it will run away from you.

But, once in a while, people enter your life that you love—not for what they give you—but for what they are. The beauty you see in them is a reflection of the Creator, so you love them. Now suddenly it isn’t about what you’re getting, but rather what you can give. This is unselfish love. This second type of love is the most rare. And if it is based in, and not competing with, the love of God, it will also bring about the most joy. To love in any other way is to need, to be dependent, to have expectations—all the ingredients for misery and disappointment.”