Back when I used to teach high school we'd cover the Declaration of Independence. I'd tell my kids that it was essentially a "break up" letter that England got from its significant other.
I told them that when you get one of those letters, you're wasting your time trying to fight it out, begging for them to stay, threatening them, or any of those things. If one part of a relationship wants out, let them go. The relationship will never be the same.
This is the same scenario. Gus is out of love with AU. AU is out of love with him. No matter what happens -- stay or go -- the relationship is fractured. He will always be looking for a way to leave with dignity. We'll always be looking for a way to shove him out.
I'll credit our friends at al.com for doing their best to screw up the relationship and to make sure that they poison the pool of next potential girlfriends.