一时心动一世情伤
[yī shí xīn dòng yī shì qíng shāng]
'A Momentary Heart Fluctuation Brings a Lifetime of Emotional Pain' implies that one fleeting feeling led to everlasting pain. It describes a situation where someone falls deeply in love with another at first sight, but ends up experiencing long-term pain because the feelings aren't reciprocated or things end badly.