暧昧成瘾不走心久爱成性不花心
[ài mèi chéng yĭn bù zŏu xīn jiŭ ài chéng xìng bù huā xīn]
This indicates a tendency towards ambiguous relations that doesn’t affect core emotions, as well as having a lasting relationship that remains dedicated rather than easily infatuated. Contrasts between fleeting infatuations and sincere long-term feelings.