谁若对我真心我定不辜负
[shéi ruò duì wŏ zhēn xīn wŏ dìng bù gū fù]
Translating into 'If anyone treats me sincerely, I won't let them down'. The person promises to be worthy of genuine treatment. It signifies respect towards true sincerity, indicating the intention of mutual respect and loyalty in relationships.