Question

when is it justifiable to keep a secret

Answer 1

Answer: It is okay to keep things to yourself if it has no impact on that person.

Explanation: My therapist said when it comes to somethings you do not ever have to tell your partner. I use to struggle with wanting to tell people about my abuse, when I told my therapist she said it's truly none of their business.

Answer 2

Answer:

If someone has specifically asked you to because it would be detrimental to them if it got out.

or

To protect someone in general

or

if it could cause harm to you or others