我也曾真心待你何耐良心喂了狗
[wŏ yĕ céng zhēn xīn dài nĭ hé nài liáng xīn wèi le gŏu]
'I once sincerely treated you, but in vain, since your conscience was given to dogs' conveys disappointment and bitterness towards someone who betrayed kindness. The phrase reflects feelings of regret and dissatisfaction at being deceived or let down.