原配终究抵不过小三
[yuán pèi zhōng jiū dĭ bù guò xiăo sān]
'原配终究抵不过小三' implies disappointment and pain experienced by a legally married spouse when unable to compete against the third party involved (often referring colloquially to an unmarried mistress). It can translate to 'The original spouse cannot prevail over the affair partner.' This is a commentary on fidelity challenges in relationships.