"the grass is always greener on the other side": The others' circumstances seem more desirable.

catch one's eye, attract one's attention

cheating or deceiving to favor oneself at gambling or some other activity, such as by making sure the dice roll a certain way, or by rigging a deal of cards / such a cheat or deception

(gambling, idiomatic) doubles: two of the same number other than 1, after rolling two dice / (gambling, idiomatic) in a forecast bet, betting that the same horse wins twice in a row

have an eye on

(idiomatic) a temptation

(idiomatic) watch out for, keep an eye out for

be intolerable

be wide-eyed, be amazed

stand out, attract notice