心心念念这么久一个人到头来还不是说走就走
[xīn xīn niàn niàn zhè me jiŭ yī gè rén dào tóu lái hái bù shì shuō zŏu jiù zŏu]
'After all this time yearning for someone (or something), one ultimately still leaves without hesitation.' It conveys the sentiment of feeling abandoned or left behind despite deep longing or effort.