她是有多好让你忘了我的好
[tā shì yŏu duō hăo ràng nĭ wàng le wŏ de hăo]
This implies jealousy or dissatisfaction with someone forgetting the speaker's worth due to someone else. There's a tone of longing and bitterness, questioning how much better the other person can be to deserve replacing oneself in someone’s heart.