分手了就别说你还爱着我
[fēn shŏu le jiù bié shuō nĭ hái ài zhe wŏ]
'If you've broken up, don't say you still love me.' This nickname likely conveys a message of heartache after a breakup; it's saying even if you're told they still have feelings, there's now a clear distance or finality that has formed between them.