u/Fun-Present8033

So, i recently watched a sensational movie with Robert Pattinson and Zendaya. Everyone around me discussing about popular questions like "What would you do in this situation? Is it worth to evaluating person by their thoughts rather than their action? and etc.
But after watching the movie i'm only concerned about one question. Where is the boundary that you can tell your partner or other people? All people have some secrets that other don't know about. So my question is "What things are worth sharing with close friends and partner, and what should be a kept a secret forever?

It would be very interesting to know your opinions on this matter