吃过醋的男人才是好男人
[chī guò cù de nán rén cái shì hăo nán rén]
'A man who has felt jealous (吃過醋, literally 'eaten vinegar') is a good man.' It signifies emotional maturity or depth, showing one's passionate side, especially regarding love or relationships, akin to acknowledging jealousy as a form of care.