Quote Originally Posted by ThisYouWillDo View Post

(Sometimes a partnership is forced to continue for economic/family/other reasons or because one partner simply refuses to accept the reality that the relationship has broken down. That is a different situation from what I have described above. And to my mind, there can be no cheating because the undertakings evaporated when the partnership hit the rocks and the "wayward" partner has no duty of fidelity towards the other.)
Bingo.