Sotto - I don't often post these days but you raise an interesting point.
I think the term MLC encompasses a wide range of behaviours - and certainly the person going through it isn't acting in a mature way - There may be 50 ways to leave your lover, but an affair is never a good idea.
For me there are a number of 'tells' - one is totally uncharacteristic behaviour. People other than the immediate family are shell-shocked.
Another is total disconnect with their previous life, activities and friends. They drop the marriage and their former life. Maybe keep up with one or two people (who were not necessarily in their pre-MLC inner circle)
In many cases (not all) they are raging and vengeful at some point, and will seek to asset strip their family and spouse.
In other words, in MLC they flip out into being someone else that we, the immediate family, and their closest friends simply do not recognise at all. They are like an alien in your spouse's skin, they have dead eyes and no empathy at all.
