In short; I was trying to suggest it was the last straw, a realization that he doesn't belong.
Perhaps my analogy was not as clear as I'd intended, but I was trying to paint him as a banana fish who swam into the hole and had eaten the one-too-many-eth banana that put him over the limit to swim out through the door.
I repeat the concept later in my post which you have already commented on:
I'm not yet convinced there is anything sexual in the story, the name he begins to call his wife is "Miss Spiritual Tramp of 1948" he might have called her just a tramp or Miss World Tramp of 1948, but with all that he may have experienced in the war it is the spirit; something much deeper or beyond sex that he identifies with or is looking for. And the fact that she giggles when disclosing the new name to her mother suggests she is without a clue.
I did not know this; interesting. In my opinion it seems that their last interaction certainly may have caused him to see what he had not seen before, unbeknownst to her and yet probably because of her. Does that qualify as a prophetess? Perhaps in a general way, it does. Thanks for sharing that nugget with us.