精神出軌 [－－－轨]

Jyutping zing1 san4 ceot1 gwai2
Pinyin jīng shén chū guǐ

Definitions (Wiktionary)
  1. verb, neologism, slang
    to cheat on one's partner on an emotional level only, i.e. to have an affair without having sex with others; to have a platonic affair