He loves you because He created you. Have you ever watched a mother and father ooh and ahh over their newborn baby? Newborn babies can be just about the ugliest creatures on earth. But not to the parents. They think their baby is the greatest. Why? Because they created the little critter. God loves you because He created you. He thinks you are the greatest.
But more than that, He loves you not because you are lovable, but because He is a God of love. It is His character to love. And there is nothing you can do to make Him stop loving you.