君既无心我便休
[jūn jì wú xīn wŏ biàn xiū]
'既然你无情，我也就不追究了'. A verse that comes across as quite poetic. If you do not have feelings towards me or you are indifferent, then I will stop pursuing you further. This could come from ancient Chinese lyrics or poetry, embodying one-sided love or giving up because the other party does not reciprocate.