On the one hand, I do think that we need to be more open about these things. You wouldn't hide the fact that you had a physical illness so why hide the fact that you have a mental health issue? On the other, I know from experience that I have to be careful who I tell about my previous bouts of depression as some people are not at all sympathetic, some will use the information against you and some just plain don't understand.
I recently stopped off at my MIL's on the way home from a visit to a friend who has suffered at times from depression so bad that she cannot work or sometimes even function normally. Thankfully, at present, she is feeling a lot better although is still unwell. My MIL has met this friend a handful of times and last spoke to her at my son's second birthday party. My son is now ten, so that was quite a while ago. During my visit she asked me a couple of times about my friend and how she was. Both times I replied, "Fine." I was very unwilling to say more as my friend had not authorised me to do so and my MIL barely knows her! Also, MIL has a deserved reputation for being unable to keep her mouth shut.
She later asked me again on the 'phone and I again said, "Fine." and told her quite bluntly that she had now asked me three times and that was all I was ever going to say. She then did her usual thing when challenged about her nosiness in telling me that I was unreasonable and that she was just displaying concern. For someone she last spoke to eight years ago. On a very sensitive topic. Yeah right.
AIBU in thinking that I am not at fault, despite her best efforts to persuade me otherwise? She knows that my friend has depression and she was after detail. I asked my friend what I should have said and she told me to just say that she does a lot of handicrafts at present. There will be a next time. AIBU in feeling that this is less about concern than voyeurism?