I tried to explain what love is. Words don't come easily to me. Victor Hugo (from Les Miserables fame) descibes so closely to how I understand it. I shall leave you with this:-

Love partakes of the soul itself.
It is of the same nature.
Like the soul, it is a divine spark; it is incorruptible, indivisible, imperishable.
It is a point of fire within us, which is immortal and infinite, which nothing can limit and nothing can extinguish.
We feel it burning even in the marrow of our bones, and we see it radiate even to the depths of the sky.