The fact that she treats him terribly, however, is definitely known to him, and it is for this reason that Prudie suggests you say nothing.
Prudie's suggestion is that you do not make any comments.
mnli hypothesis: Prudie's suggestion is that you do not make any comments. premise: The fact that she treats him terribly, however, is definitely known to him, and it is for this reason that Prudie suggests you say nothing.