I suppose this would to some extent relate to how much it viscerally hurts the offended spouse. My hypothesis is that a well-bred, well-to-do Catholic woman is probably going to be wounded by it much deeper than a woman that has a history herself, since the later is more desensitized both by the pervasive surrounding culture and her own experiences. The former is how you ought to feel (properly: it is objectively beneficial to be grievously wounded by adultery, both because of the recognition of the evil itself, and as a medicinal means to repairing the rift: the hurt of the offended party is an instrument which may produce sorrow in the offender. Or: the suffering of the wife also exists for the benefit of the sinner. She becomes a sacrificial lamb, or a Christ/Marian figure. This is the faculty of human emotion serving in a positive manner towards the salvation of others (along with the sanctification of the self). The suffering takes on the kind of “missionary” role that is described in Romans, when contending with situations of hardship that were not merited. This is a contrast from a conscience “burned with a hot iron”. If there is no longer an innate repulsion to sin, there is no longer a motivation to flee from it.
My original idea, that it is wiser for the wife to continue conjugal relations, I think was influenced by the notion that to do otherwise would greatly risk a complete rupture. The fault in that thinking is the rupture already exists anyway. Although a suspension of conjugal relationship might indeed cause a separation, you’re forcing the issue to a conclusion. The husband might abandon ship or he might undergo the necessary spiritual mortification. If conjugal relations persist, it may lead to a perpetual dysfunction in the marriage, where both Baal and Christ are active in the marriage for year after year.