许多事情已回不去太多后悔藏在心窝
[xŭ duō shì qíng yĭ huí bù qù tài duō hòu huĭ zàng zài xīn wō]
This indicates that many things cannot be reversed, reflecting regretful memories hidden deep in one's heart. It suggests someone who might be contemplative or nostalgic about past mistakes or lost moments.