ANSWERS. Its LONG. But hey, you asked.
I beleive that his wife's jealousy is the central concept at play here...It seems that the title indicates that Hearst is an implicated man and , given the apparent theme of misdirection the movie conveys, the suspicion that is most important is that of his wife's. Her misunderstanding of the relationship with him and her neice was evidence of her skewed view of his actions with young girls because she too had developed such a close relationship with him at such a young age, she misunderstood that his role to these other girls would develop into something similar, and she would lose him. Her extreme jealousy tainted her perception of his innocent relationships (even hi-bye or simply pictures, which they turned out to be, of course). These misdrawn conclusions cut off the sex for TWO YEARS, and remember, he IS ENTIRELY INNOCENT...so he was given a life sentence of mistreatment by his wife, and rightfully he felt dejected frustrated, sad, etc...His life had become the sum total of the torture of the "sixty feet of hallway"...probably not an existence he was overly attached to. He knew she was listening and watching and even told her to come face him, she refused. Hearst was given his final rejection by her and he became despondant, because he thought she knew he was telling the truth. She spit when he confessed, because she knew it was the ultimate apology to her for her false accusations of infidelity, and his confession infuriated and hurt her. Guilt/anger kind of response. Well, once the killer had been caught, her eyes were opened to the truth of her insane jealousy and looked to reconcile...but the damage was done. Both, by his confessions, and her selling him out with the pictures. That was the jealousy being "taken this far". She was trying to prove her suspicions correct,and it, well, didn't. He knew his relationship could never be salvaged, now from his perspective, as it was from her perspective before.
His confession was his version of throwing up his hands and saying i can't do this anymore. Fighting. Seperation. Divorce. Infidelity. His confession tone was monotonous, very unlike his previous animated, and obviously true, self. Kinda the tone a child gets when forced to apologize to his child rival/enemy.
Sorry. I talk alot. But once you change the focus from a suspicion of murder to one of EXTREME jealously, it helps. I encourage discussion.