我的爱人一次不忠终身不用
[wŏ de ài rén yī cì bù zhōng zhōng shēn bù yòng]
This is quite direct, translating to 'My lover’s one act of disloyalty makes him dispensable'. Here, betrayal through infidelity results in permanent loss of trust and affection. The individual vows not to have anything to do with their partner anymore.