I don't post very often but felt compelled to comment on this. My sitch is different to a lot on here in that we weren't married and don't have children. My WS never wanted children and I tbh was happy to go along with that. MLC in my mind is not just something that "happens" to married men (or women) with children but to anyone who finds themselves faced with feelings of unhappiness (because of depression or whatever reason) they look at their lives to see why and often reach the conclusion that its their whole life that wrong and the cause of their unhappiness. So they want the complete opposite of what they have - mine had the life of Riley and has swopped it for a life back in his home town, living with his mum, in his old bedroom, trying to recreate the life he had when he was 20.
WS was quite lucid after BD and told me that it was little things at first, but it was never about me, he the started to resent me because I was happy and had everything and he felt like he had nothing. He didnt know who he was or what he wanted. Except he wanted to be free to live his life like he had at 20 when he was the centre of everyone's world and got invited to everything. In his mind he couldn't rekindle old friendships, play golf or whatever and be with me. He couldn't or wouldn't acknowledge that he was responsible for letting those friendships lapse. That was apparently my fault.
His OW is a married mother of 2 small boys who he had a few dates with before he met me. She is the polar opposite of me in every way. His life now, or what bit I know of it, is the polar opposite of our life. He is truly unrecognisable to me as the person I was with for nearly 15 years.
Point is though its the total OPPOSITE of what he had and the total oposite of what many of your H or W have run too. Because in my mind its not just about regression its about running to the fantasy world they had been constructing in their twisted messed up minds and they believe that doing that will "cure" their confusion, depression, unhappiness, whatever.
I guess the point I'm trying to make in a rather convoluted way, is that we shouldn't beat ourselves up thinking they are having a wonderful time being free being with someone younger or whatever, it not about that its about them trying to make the fantasy a reality. As we all know in most cases fantasy rarely stays that
As trustandlove said its not about OW its about what they represent.
Hugs to all
Xx