In thinking about this topic, I wonder if their ability to use this defense mechanism, compartmentalization, as well as justification, determines how much distance they need.
Now that is very possible, LGO; it also depends on how much pain they are in, and how much of a failure they perceive themselves to be.
The crisis is very similar to a "starting over" and an ending must be had before a "new" beginning can be achieved.
That may also be why most MLC'ers don't recognize their LBS' as meaning anything to them; not even as their wives...or even their friend, girlfriend.
It's like a "void" exists for a period of time in regards to a longstanding relationship....now, we KNOW the MLC affair is a band aid for their pain; and it's not a "real" relationship; yet, those who get "stuck" and marry these types of people; are continuing in their own brand of "denial"..which extends beyond the actual stage they went through before.
Both people in these types of relationships are always trying to stay "young" and think that time has "stood still" for them...and they are surprised in the end, to find they are just as mortal as their counterparts who've resolved their crisis; and gone on to make/rebuild a much stronger marriage than they had before.
I sincerely believe they never completely get away from the crisis, even though they are stuck within its clutches....I also believe that once death is near for them; they go through a final crisis of a sort; but then it's too late to do anything about it...so they are tormented until they die.
I say that because of a man I once knew that had done many bad things in his life; and I believe now, he'd gotten stuck in the tunnel...I don't remember how old he was; I tended to him when I worked in the nursing home many years ago...but every couple of days, he would start ranting and raving; crying and cursing. It was said that he'd molested one of his children, and had done some other things that were unthinkable; but I don't know that for sure..I just knew from talking to him that he'd done many bad things in his life...some things he said smacked of the tunnel; I remembered them as I was learning about the crisis before.
You'd ask him about his wife, and he would tell you he either had no wife, or he "got rid" of her sometime ago...I found out he gotten divorced years back...and now, thinking about it, I wonder.
Didn't mean to go off track, slightly; but it's been something I've been thinking about for some time.