I feel like such a failure.
No. You are trying to hold everything together, keeping your family's wheels turning while still being abused, but he has ramped it up because he is angry at you for ending the marriage. This is not down to you, it's down to him. Please don't blame yourself.
I feel so guilty for messing up my kids lives.
You haven't messed up their lives, their father did by being abusive. You are trying to make a better life for them and you by getting away from the abuse. If he wasn't abusive you wouldn't have to be doing this. Please don't blame yourself.
Maybe I deserve it though.
Stop that right now! Nobody deserves to be abused. If he wasn't abusive you wouldn't want away from him. You do not deserve this, your children do not deserve this. Would you think anybody else going through what you're going through deserves what he's doing? No, nor do you. Please don't try taking responsibility for the actions he refuses to take responsibility for. Do you have any anger in there? You need to start finding your anger, who the fuck does this no mark think he is treating you and your children the way he does, he's nothing but a weak little 'man'. Strong men don't abuse.
I hate being in the house with him ignoring me.
As I said before, start playing him at his own game. Pretend he's not there, work round him, don't try to get attention or reaction from him. ALL of his behaviour is abusive and the more you want from him the less he'll give and that's just setting him up to abuse you all the more. Grey rock.
And if by any chance that works and he stops stonewalling you - don't be fooled. It is not things improving, it's just another tactic of the abuse. He will be trying to give you a false sense of security. Never trust this man, ever.
Now he’s lost his job and maybe that’s because of the stress I’ve put him under.
Back to point 1. If he didn't abuse you you wouldn't have ended the marriage. This is not your doing. Can't you see that you're not responsible for his behaviour? Please don't blame yourself.
It's so much worse because he has escalated his abusive behaviour because you've injured his ego. It was never going to be easy staying in the same house. Are you still in touch with Women's Aid? I really think it would be a good idea for you to try and speak to someone again today, if possible. Just for a bit of RL support.
Please @Sadandbroken1 , stop blaming yourself 