百里情深不及他人言笑诋毁
[băi lĭ qíng shēn bù jí tā rén yán xiào dĭ huĭ]
It describes a deep affection over long distances ('hundred miles') being overshadowed by someone else's gossip or ridicule ('others' laughter and insults'), highlighting a bitter contrast between genuine emotions and societal superficiality.