我百毒不侵却怕她入你心我刀枪不入却怕你入他心
[wŏ băi dú bù qīn què pà tā rù nĭ xīn wŏ dāo qiāng bù rù què pà nĭ rù tā xīn]
Though nothing bothers me, I fear that she has taken hold of your heart; though I am unbreakable, I dread that you have moved on to someone else expresses feelings of insecurity and jealousy. Despite being emotionally strong, these fears create vulnerability.