爱上错的人就只会伤害自己
[ài shàng cuò de rén jiù zhĭ huì shāng hài zì jĭ]
This translates to 'Falling in love with the wrong person only harms yourself.' It conveys a painful experience where one realizes they’ve made a mistake in choosing a partner. The regret and emotional harm inflicted on oneself through such poor choices can be profound and lingering. It indicates self-reflection and sorrow over lost time and trust.