掏心掏肺为爱人没心没肺守爱人
[tāo xīn tāo fèi wéi ài rén méi xīn méi fèi shŏu ài rén]
'Pour out all love to beloved ones and protect the beloved recklessly' - this conveys unconditional loyalty and self-sacrifice towards loved ones (romantic partner), expressing utmost honesty and dedication toward someone close to them, possibly implying they once sacrificed themselves for their partner