The grass is always greener on the other side

Translations
Трава всегда зеленее на другой стороне
Someone always thinks the grass is greener on the other side, but they should appreciate what they have.
Кто-то всегда думает, что трава зеленее на другой стороне, но им следует ценить то, что у них есть.
Definitions
This phrase means that people often believe that others have it better or that different circumstances would be more favorable, even if that is not necessarily true. It reflects a tendency to envy what others have while overlooking the advantages of one's own situation.
Words
grass

noun
трава
side

noun
сторона
green

adjective
зелёный
always

adverb
всегда