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

the grass is always greener on the other side

other people / stranger

even if one says

always

enviable / jealous, envious

grass, a lawn

blue / (of vegetation or traffic lights) green / pale / unripe; green (inexperienced)

(lost seeing ability): blind / (micro): micro / (out of sight): invisible, hidden / (speed): high-speed, rapid / (sense): noise, smell, temperature, energy, health, mentality / (transparent): transparent

(humble) to meet with someone, to have an audience with someone / to make an appearance, to be present / (possibly archaic) to serve someone, such as a master or husband