She'll fall apart if you leave her and you'll need a dust pan to scoop up the pieces.
WRONG! Leaving her is the best thing you can do for her. You see, if you're thinking about doing it...you're already gone. So you might as well grab your gym bag and hit the road. You staying for her sake, well....it's selfish.
Although you think she will become one of those crazy haired, cat ladies who eats out of dented cans....that's not going to happen. Most likely, once your gone, she'll breathe. And all the noise that was clouding her head will go away...when you do. And then she can get a hobby. And maybe even a handsome lover. Or a new car. Heck it doesn't matter what she does...because at least she's doing something. And if she makes a mess, at least she made it. My bet is that she'd rather clean up her own mess than rationalize yours.