He doesn't go through these up and down feelings because His very nature, the essence of His being is love. There is nothing that God does that is not loving because God is love. Because God is Love, God's Children are to be Loving . Here's a heads up to church leaders. If we want our people to love each other, they must see godly love flowing from our lives.
Unbelievers can never act in true love.
The unsaved person can love in an earthly sense. He can have deep affection and strong feelings but when the feelings fade, he leaves. A lack of maturity is seen in a lack of love. I know believers, people in whom a passion for God once burned bright, but now have become bitter, resentful, angry and loveless. Such a person may be saved, but no longer abides in or has fellowship with Christ.