Not at all unusual for men to deliver the Script, unfortunately. This entirely predictable exercise in self-justification for atrociously entitled behaviour is a different creature from the everyday whinges and "What to do?" discussions that emerge around the second large glass of wine.
OP's Darling Husband is working his way through the main points quite efficiently. I've copied this list from one of many MN threads (and articles on the wider Web, plus books) on The Script:
I'm not happy, haven't been for a long time
🟩You've let yourself go
🟩You're not the girl I married
🟩You went off sex after having my baby / children
🟩Your body changed after having my baby / children
🟩You've let the house go, it's a tip
🟩We have nothing in common
🟩There's nobody else
🟩All you ever think about is the kids, they take all your time and attention
🟩You expect me to share housework and childcare when I want to cycle / play golf / go to football (add/delete as appropriate)
🟩No, I said there's nobody else
🟩You're making it up / imagining things / crazy
🟩You know what you're like
🟩We don't need a solicitor, we can do it ourselves
🟩Well, you stayed at home doing nothing (creating and nurturing x human beings and our home doesn't count) and I paid the mortgage so you're not entitled to the house, or anything really
🟩We only met recently. After you and I split up. Honest.
🟩You're not getting your hands on the house / my income / my savings / my pension.
🟩I'm having 50/50 with the kids, which I absolutely understand will entail me learning how to look after them and will step up and do it all, yes, definitely.
🟩She's crazy, look what I had to put up with.
🟩You know that 50/50 I was suddenly so insistent on, well I can't have the kids / do the school run / take them to their appointment after all because (insert and delete as appropriate).
🟩Is it too late for us, please can I come back? Her kids are doing my head in.
🟩 Why not? Why would you break up our family?
https://www.mumsnet.com/talk/relationships/5169069-the-script-what-would-you-add