我对你那么糟你却对我很好
[wŏ duì nĭ nèi me zāo nĭ què duì wŏ hĕn hăo]
The phrase means 'I treat you so badly, yet you treat me very well,' showing a contrast in the way someone else has treated the speaker better than the speaker deserved. It conveys a sense of gratitude tinged with guilt.