Very tough. It's one of those things with depression. It carries a kind of shame enmeshed in it so that people feel too ashamed to talk about it - just when that's the thing they most need to do. It hurts too when one realizes that someone one was very close to still couldn't share at that deep personal level. Or at least it does for me.
I'll have to take you at your word. Personally, I'm inclined to believe that anyone with a good brain, man or woman, is likely to be highly complex - and by that, I don't mean a euphemism for neurotic. Intelligence is such a vast complex of complex processes.