痴情少年长厮守绝情少女断相思
[chī qíng shăo nián zhăng sī shŏu jué qíng shăo nǚ duàn xiāng sī]
Roughly translated as 'The passionate young boy wishes to stay forever while the unfeeling girl ends their love.' It describes the disparity in emotions between young lovers where one person's feelings aren't reciprocated by the other.