Wiktionary
the grass is always greener on the other side
alt. Other circumstances seem more desirable than one's own but in reality are often not. prov. Other circumstances seem more desirable than one's own but in reality are often not.
Usage examples of "the grass is always greener on the other side".
The attitude, common to the general run of mankind, that the grass is always greener on the other side of the fence, was incomprehensible to Shelyid.