The central problem the fellow was grappling with wasn’t lust, it was pride. There’s no such thing as protecting your wife by sinning. The only way out of the “damned if you do, damned if you don’t” conundrum is to take yourself out of the center altogether, to admit defeat, to seek personal repentance, and to let God work out how to bring salvation out of that humility. The fellow couldn’t make any progress with his sexual compulsions because he was trying very hard to make sure he was still in charge — not only of his own behavior and his own soul, but his wife’s soul, as well.
This plea goes for sinners whose souls are heavy with old-fashioned sins of the flesh, and also for sinners whose souls are heavy with the even older sins of pride and presumption.