UnconditionalLove, the most important thing to remember is that our spouse is in crisis. This means that they are almost opposite of who they used to be. They are not out there having the same sort of relationships that we had with them pre-crisis.
As HB used to say, opposites attract usually, but in crisis, like attracts like.
So, you have one messed up MLCer attracting an equally messed up Other Person.
Even if they are together a long time, or forever, it is nothing like the relationships that we had, or would want to be in.