Does this sound like a case of cherchez la femme, to you, or something different?
Married 25 years, no history of cheating. Not much in the way of arguments or disagreements, always got on very well. No signs of cheating whatsoever. Then out of the blue, during a minor disagreement, DH says he's 'done' and wants a divorce. He's an older man and I have never heard him use the expression 'done' in that context or any similar context. I would never have expected him to ever say he wanted a divorce. Shocking in itself, but the choice of terminology also shocked me. It sounded so completely unlike him.
He also tells me to 'fuck off' but then follows that up with 'all of you, just fuck off'. There was only me and him in the room at the time. We only have one grown-up DC living with us so saying 'all' of you didn't make sense. Surely he'd say 'both'?