What agony he suffered as he watched that light, in whose golden atmosphere were moving, behind the closed sash, the unseen and detested pair, as he listened to that murmur which revealed the presence of the man who had crept in after his own departure, the perfidy of Odette, and the pleasures which she was at that moment tasting with the stranger. And yet he was not sorry that he had come; the torment which had forced him to leave his own house had lost its sharpness when it lost its uncertainty, now that Odette's other life, of which he had had, at that first moment, a sudden helpless suspicion, was definitely there, almost within his grasp, before his eyes, in the full glare of the lamp-light, caught and kept there, an unwitting prisoner, in that room into which, when he would, he might force his way to surprise and seize it; or rather he would tap upon the shutters, as he had often done when he had come there very late, and by that signal Odette would at least learn that he knew, that he had seen the light and had heard the voices; while he himself, who a moment ago had been picturing her as laughing at him, as sharing with that other the knowledge of how effectively he had been tricked, now it was he that saw them, confident and persistent in their error, tricked and trapped by none other than himself, whom they believed to be a mile away, but who was there, in person, there with a plan, there with the knowledge that he was going, in another minute, to tap upon the shutter. And, perhaps, what he felt (almost an agreeable feeling) at that moment was something more than relief at the solution of a doubt, at the soothing of a pain; was an intellectual pleasure.
Marcel Proust, Swann's Way
adultery, doubt, relief, suspicion