我的爱人一次不忠终生不用
[wŏ de ài rén yī cì bù zhōng zhōng shēng bù yòng]
Translating to 'My love, once unfaithful, no longer has a place in my life'. This reveals someone's strong belief in loyalty within relationships, stating that one act of infidelity is too much, resulting in permanent termination of the relationship.