I have a friend who is really going through it with a coworker of hers. The woman is basically a ranting, raving lunatic who is functional enough to hold a steady job and manage day to day life.
My friend is puzzled at this woman's behavior because of her age. "She's 49 years old for god's sake! When is she ever gonna grow up?" It was then that I had to clue my friend in on one of life's many lessons and said, "Sweetheart, you don't grow out of crazy."
And you don't. If anything, you grow into it. As a people get older, they gain more freedom to be just as crazy as they want to be. Who's gonna stop you from being crazy in the privacy of your own home? Exactly.
So, if you find yourself in a situation with a person whom you suspect to be crazy, and it doesn't seem to be improving, please know that it's not going to, and you might as well get out while you can!