OP,
I feel very sorry for you.
Yours is a familiar story.
Your husband is not a good husband or father.
He is a waster who only cares about himself.
He does nothing for his children and bullys you to shut you down when you try and bring it up.
You are being used by your husband and his ex as a skivvy and a mug.
Neither of them could care less about you, hence he bullys you the minute you try to say anything.
It is also a shit life for your children.
You did not sign up for this and it doesn't have to continue.
Stop expecting him to step up and be a decent man.
He is not.
He also could care less about you.
Your function is to be house skivvy so his life continues normally.
You work.
Would your family support you leaving?
Would you be able to up and leave gor a few weeks to let the penny drop that you will no longer accept this?
Start crunching the numbers and see can you manage as a single parent?
He doesn't help, so you won't miss him.
We teach people how to treat us and you have taught him that you are a skivvy that can be bullied.
The only one who can make your life better is you.
Start organising yourself and get out, even for a few weeks for a rest.
You deserve better than being used for childcare.
Your children deserve better too.