我深知多用心都打动不了你
[wŏ shēn zhī duō yòng xīn dōu dă dòng bù le nĭ]
Translates into 'I deeply know even putting more effort won’t move you', reflecting profound sorrow and resignation regarding someone's feelings towards the user. Despite trying very hard, they feel they still can't change another person’s heart or mind.