That I’ve always been a disgrace of a wife, that I make myself available to other men (have only left the house once without him or the kids in 10 years, and that was a girls dinner down the road), that I’m disloyal, a liar - crazy stuff that isn’t true.
He sounds absolutely vile. None of this stuff is true - he is saying it to make himself feel better about leaving you, as on some level he knows he's being a complete dickhead.
If you have only left the house once witbout him or the dc in ten years, this is not a normal relationship, by the way.
Have a hand hold from me.
I'd use the time while he's out in collecting everything you will need: all the paperwork, copies of bank statements, info about your h's salary, pension, investments, the kids' birth certificates, etc. etc. as you will need them. Book an appt with a solicitor too.
Your h may not just be able to leave your tenancy - he will have signed a contract, just like you did.
Good luck and stay strong.
💐