What the Bible says about "Grass is always greener" disease
(From Forerunner Commentary)
The existence of this exhortation to seek Him only and destroy the worship of Canaan's inhabitants is strong evidence that God foresaw that Israel was thoroughly smitten with "the grass is always greener" disease. They failed both to dispossess the land's inhabitants and to destroy their places of worship. History records that God was right, and Israel is left without excuse for its spiritual adultery.
John W. Ritenbaugh
The Beast and Babylon (Part Six): The Woman's Character
These verses provide a basic guideline for avoiding entrapment by this alluring heart of the Babylonish system. Since this system has its basis in human nature, it feeds right into the desires for frequent change and variety of experience as the answers to fulfillment in life. The Bible, however, clearly reveals God drawing His children into His oneness, which is diametrically opposed to the world's system. It promotes fulfillment in material things, excitement, gratification of the flesh, and variety of religious experience. Its major fruits are easily seen in the world around us as confusion of purpose, competition, disharmony, disunity, separation from each other and God, and death.
The result is that this world is not a happy place to live in. None of these factors can give a lasting sense of peace, fulfillment, and abundant living because none of them harmonizes with the purpose of God. They can only produce a temporary burst of emotional well-being or satisfaction.
God instructed Israel often and in many ways against this proclivity. They were to seek only Him in His only habitation in Jerusalem. Israel, though, is disastrously curious and incautious and filled with discontented, unsettled, impatient, "grass is always greener" yearnings.
John W. Ritenbaugh
The Beast and Babylon (Part Seven): How Can Israel Be the Great Whore?