l’herbe est plus verte ailleurs bedeutet auf Englisch

the grass is always greener on the other side▼(others' circumstances seem more desirable than one's own but in reality often are not.)
phrase
[UK: ðə ɡrɑːs ɪz ˈɔːl.weɪz ˈɡriː.nə(r) ɒn ðə ˈʌð.ə(r) saɪd] [US: ðə ˈɡræs ˈɪz ˈɔːl.weɪz ˈɡriː.nər ɑːn ðə ˈʌð.r̩ ˈsaɪd]