So I searched.
And the vast majority of the results were along the lines of "That was it!" "I could not handle it". "Why did he tell me now, after all these years"
Betrayal. Broken trus. Fear. Hatred.
That is what our partners feel, when we are be open. For those of you are deep into a relationship - I cannot advise. For those who are entering one - for you, and for her. Be open.