tell me about it
You could have told me about it.
You should have told me about it.
Tu aurais dû m'en parler hier.
You should have told me about it yesterday.
Do you want to talk to me about it?
Comment as-tu pu ne pas m'en parler ?
How could you not have told me about it?
You could have told me about it.
Without telling me?
Would you like to talk to me about it?