If we love people, but not God, we are setting ourselves up for disappointment after bitter disappointment. Our natural instinct is to think of ones self first. It takes effort to put someone needs ahead of your own, especially, if the gesture is not noticed and appreciated.
We will demand what cannot be given. Cry for a whole pizza when there is only half left. We will think we are good and deserving and wonder why others don't reciprocate. Our inclination is to base our opinion of others on ideas we've formed and not facts.
There is only one true love. Only one saving grace and grand mercy. And, it will not be from the person sitting next to you.