未恨你负义我恨我痴心
[wèi hèn nĭ fù yì wŏ hèn wŏ chī xīn]
It means 'I don't blame you for being unfaithful, I only blame myself for being deeply in love'. This conveys a complex feeling of self-reflection where the user forgives the lover for wrongdoing but is disappointed in their own deep affection.