你说不会让我伤心难过你说会像天使守护着我
[nĭ shuō bù huì ràng wŏ shāng xīn nán guò nĭ shuō huì xiàng tiān shĭ shŏu hù zhe wŏ]
This expresses hope in a partner's promise not to cause pain but instead to protect as an angel would. It reflects trust in someone’s pledge to treat them gently and lovingly, like a guardian angel.