本不该

shouldn't have

→ 本
phrase Rare #29,611
shouldn't have Often expresses regret or criticism about something that happened, or that something should not have happened.
CH: 我本不该答应这件事。
EN: I shouldn't have agreed to this.

你本不该把人卖了的。

You never should have sold him out.

你本不该透露秘密的。

You shouldn't have revealed the secret.