@Howtorespond
They see and acknowledge his behaviours to me, although an awful lot goes on behind closed doors they don’t see.
I have a feeling (born of experience) that your DC are hoping and praying that you leave him. They just don't want to say anything because they don't realize that you are ready, you're just afraid. You know your children best, you'll know when the right time is to tell them you want to leave. Just don't be afraid to enlist their support if you know they'll support you.
I left a 38 year marriage a year ago when my esDH's drinking spun out of control. When I called my DS1 to say I'd been escorted out by the cops and could I stay with him the first words out of his mouth were "It's about time!". DS2 had the same reaction. And they both said "If you go back, we'll never speak to you again" (not truly seriously). TBH since I left I'm seeing things that were 'normal' in my marriage that I hadn't seen clearly before were truly 'abnormal'.
As a PP above said, life is different, but I am truly happy! I am lucky in that my living standard hasn't really changed other than that I will never own a home again. The prices are too ridiculous where I live and half of the profit when our house is sold will not be enough to reduce a mortgage to something I can afford. But I love my little flat. When something goes wrong I pick up the phone and maintenance is dispatched, rather than having to argue with esDH about either fixing something himself or calling a repairman. My little flat is peaceful and calm. Everything is neat and tidy. And most importantly, it is 'my castle, my rules'.
I suggest you quietly see a solicitor. Give them a 'snapshot' of all finances (yours, his, and ours) and details regarding your home mortgage. They can give you an idea of what you may be able to expect financially. Once you have that information, make the decision that is right for you. Better to eat beans in a bedsit on your own than dine on filet mignon in a mansion with a man like that.