The biggest difference I see between a WA spouse and a MLCer is that the WA will plan for the event of leaving. Often making sure there's a place to live such as an apartment or having the spouse move out and the finances are in order.
A MLCer doesn't generally plan. My H for instance re-met the ow he dated in HS 40 years previously at her father's funeral home viewing. He moved in with her 2 weeks later, blindsiding his family and friends.
We all go through life transitions. It's when a transition runs off the tracks that it becomes a crisis. Depression can certainly derail the train.
MLCer or WA, doesn't really matter you still DB if you want to try and save your marriage.
