因为你我学着狠心因为你我变得无情
[yīn wéi nĭ wŏ xué zhe hĕn xīn yīn wéi nĭ wŏ biàn dé wú qíng]
'Because of you I learn to be heartless; because of you I become unfeeling.' This reflects emotions after experiencing pain or betrayal leading to becoming emotionally guarded.