Tā zūnzhòng jūn zǐ zhī jiāo de yuánzé, bǎochí shìdàng jùlí.
He respects the principle of gentlemanly friendship and keeps a proper distance.
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From 《庄子·山木》: 君子之交淡若水,小人之交甘若醴 — 'a gentleman's friendship is bland as water, a petty man's is sweet as sweet wine.' Zhuangzi's point: the plainer bond lasts, the flattering one sours.