不曾说过它也会转瞬成空
[bù céng shuō guò tā yĕ huì zhuăn shùn chéng kōng]
'It becomes void immediately even if it isn't said'. This may imply an awareness that something can vanish quickly or change drastically, no matter whether it has been spoken out or not - perhaps highlighting the transitory nature of words or situations. In the context of romance, it may reflect on fleeting passions and the volatility of expressions of affection.