女人再狠也狠不过小三
[nǚ rén zài hĕn yĕ hĕn bù guò xiăo sān]
The phrase implies a belief or observation that no matter how ruthless or heartless a woman can be, an affair or someone interfering with another's relationship (literally 'the third person') could be even worse. It reflects complex and often emotionally charged views on relationships, fidelity, and betrayal in some cultural contexts.