错吧暧昧当成爱错八姨妈当初夜
[cuò ba ài mèi dāng chéng ài cuò bā yí mā dāng chū yè]
'Mistook ambiguous attraction for love,' along with an informal expression indicating a misunderstanding or misplacement of emotions leading to a mistake that felt as off as a period coming at the wrong time (which is quite embarrassing or inconvenient). It shows the regret of mistaking surface-level chemistry for genuine love.