你不领情莫怪姑娘无情
[nĭ bù lĭng qíng mò guài gū niáng wú qíng]
It means if you don’t reciprocate her affection, she will act coldly. In another sense, this shows the girl’s strong-willed attitude towards romance. If someone doesn't appreciate or return my goodwill, then I have every right to stop being nice.