那个女生替我守护你
[nèi gè nǚ shēng tì wŏ shŏu hù nĭ]
Translates to 'that girl protects you for me'. This could express a sense of unfulfilled responsibility where another person (specifically, a female friend or family member) has taken up the role of caretaker for someone important to the user. This implies trust or dependence on the other individual.