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./

Dictionary of American idioms. 2013.