Accept that once you “know” there is little point in trying to “unknow’ it by, a) listening to their hogwash excuses and rationalisations or b) drinking yourself into a stupor or c) going to some dumb ass therapist who informs you your discoveries will eventually make your marriage stronger… if you give them enough time and money.
Never “own” your part. You don’t have a part. He is sick and you were duped and don’t let anyone use your hope to get you to climb aboard another pain train. Let it hurt and let it go.
No matter how badly you feel, no matter how frightened you are, no matter how much you long for the man you thought you had…..NEVER, EVER allow yourself to smoke the HOPIEM. Make a list of all the ways he abused and betrayed you and read that over and over until the urge to join him in LALA land passes.