His wife may have already told him it was over years ago and she literally left after the event. Or perhaps the event caused the divorce. Either way it is an 'affair' from his perspective.
Many people live together for years after it is clearly a failed marriage.
I was also not stating the order of the events, rather the facts of the events. The order is of little importance here. She has left him for this other man. That is her choice to make.
His wife may have already told him it was over years ago and she literally left after the event. Or perhaps the event caused the divorce. Either way it is an 'affair' from his perspective.
Many people live together for years after it is clearly a failed marriage.
I was also not stating the order of the events, rather the facts of the events. The order is of little importance here. She has left him for this other man. That is her choice to make.