This is a real balancing act. And one which some of us have a harder time with than others.
In regards to relationships I work hard to have distinct lines in the sand as it were about what is said. Privacy and discretion are things I work hard to maintain. It is far from easy. I am in the same boat as you, being open and honest about my sexuality, but people around me may not have that liberty. I have to be cognizant of that.
In the end, we all want to be open with someone but it just isn't possible. You have to respect what he doesn't want to hear as long as it doesn't become offensive to you.
There is a balance in communicating. The sender and receiver, sometimes in poly, people ignore the receivers want, in our "blind" need to communicate everything. Sometimes people forget discretion.
Will mistakes be made, yes, hopefully everyone can learn from them