猫有九条命唯有一颗心鱼有一颗心唯有九秒情
[māo yŏu jiŭ tiáo mìng wéi yŏu yī kē xīn yú yŏu yī kē xīn wéi yŏu jiŭ miăo qíng]
It compares the persistence in cats and brief memories in fish. The person could imply they possess resilience like a cat but only temporary remembrances or feelings like a fish.