It should come as no surprise that someone who has constructed a false narrative should live according to that narrative. To spend sometimes entire lives, hiding in plain sight requires enormous amounts of delusional thought. They will believe that they have done the right thing by staying closeted from all of the social pathogens they imagine there to be. Whether this is due to parental expectations or a fear of being excluded, the ramifications are the same, hiding the truth. Someone who is capable of hiding the truth from themselves, is of course not going to face the reality of what they are doing or have done. Victim mentality is very powerful, particularly in modern times. It becomes both a shield and a sword, You cannot attack them with your truth, because their shield of imagined persecution protects them. Because they are ultimately the victim in the face of repression, they can cut you down with the sword of justification. Abusers will always believe they are the victim in any relationship they have, it is what makes them so very good at it.
When it comes down to separation and divorce from these people, we have every right to tread very carefully. It is not without good reason that we fear dishonesty and selfishness. The fear that we will have to face an Anti-partner who exists now, where we thought our partners were is all too real. Should we threaten to out those who choose to lock us in their closets? Should we accept their truths as our own? It is a moral dilemma indeed. The fact that it is a dilemma, suggests that it is because we have morals still, when they seemingly do not when it comes down to us. The closet is a prison, where the straight partner is bound in lies, and gagged by inclusivity. To the point where they are ultimately the one who is excluded.