Never Understood Why...
Why did Brian attend the art showing with Bonnie (where he fights with the sculptor), when we find out right after the fight that he had already moved all of his stuff out of her apartment that day?
One could argue that Brian was still holding out hope that she would come thru and get him a sales management position at her firm that she continually dangled in front of him, but nope, that gets shot down too, when they are arguing out on the sidewalk:
Bonnie, in a desparate attempt to keep her boy-toy dangling even longer after he tells her he's moved out and hands her her apartment keys: Brian, listen baby...I've got some interviews set up for tomorrow.
Brian: Forget it! I am not a salesman! I tried to sell out to you, but I couldn't close the deal.