你是我用命疼的人你是我拿命爱的人
[nĭ shì wŏ yòng mìng téng de rén nĭ shì wŏ ná mìng ài de rén]
It means 'You are the person I am devoted enough even risking my life to love.' This shows an extreme degree of loving somebody so deeply and seriously as if the other party's existence outweighs one’s life importance.