Interesting theory FS. I will definitely have to think about it.
I have the exact same “what about me” thoughts when I see my H with the kids. It is ironic that the destruction of one relationship leads to the building of another that we are forever a part of but also not a part of. You know what I mean? My kids have been to my H’s a number of times. My son talks about the boy who lives downstairs. My daughter has a friendship with his mom (who apparently went in for a second surgery today and things are not looking good). These people are strangers to me. They are part of my H’s life - not my H, exactly, but the person who is currently occupying his body. He is creating a new reality for himself that does not include me. That hurts. It hurts a lot.