为少年枉费青春对姑娘死心塌地
[wéi shăo nián wăng fèi qīng chūn duì gū niáng sĭ xīn tā dì]
Roughly translating to 'Wasting my youth for the boy, remaining completely devoted to the girl.' It depicts a situation where one devotes all their efforts in loyalty or love, despite knowing that it might not bring results or fulfillment, reflecting unrequited love or misplaced devotion during the young and passionate days.