Honesty

Is there any limit to honesty? Is it allowed to disclose a secret just for the sake of honesty?
What if you knew some details which could affect another relationship: Are you allowed to disclose the details just because one within the relationship might need to known it in order to be able to assess the depth of the relationship? What if you might be considered to be biased? How can you exclude that you are beliefed to be biased if you disclose facts only?

So many questions and I had decided before I asked and I believe I made the right choice... Hopefully ;-)

For the sake of honesty.