猫有九条命却无九颗心
[māo yŏu jiŭ tiáo mìng què wú jiŭ kē xīn]
Based on the belief that cats have nine lives but suggests they might not be so emotionally deep, having no 'nine hearts'. This could reflect feelings of detachment or emotional aloofness from relationships, perhaps suggesting someone feels difficult to form deep emotional connections despite life experiences.