grass is always greener on the other side of the fence
grass is always greener on the other side of the fence or grass is always greener on the other side of the hill
We are often not satisfied and want to be somewhere else; a place that is far away or different seems better than where we are.
John is always changing his job because the grass always looks greener to him on the other side of the fence.
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Source: A Dictionary of American Idioms
