Your DH is lazy, selfish, uncaring, disrespectful and a whole lot more. He's an idiot for just quitting a job, but at the very least he should be doing the lion's share of the housework and cooking so that he's pulling his weight. To expect you still to do that is appalling, in fact unbelievable. And worse than that - he's actively leaving the house in a mess like a (badly behaved) teenager.... so you're picking up his post and mess when you get in from work.
You've been remarkably patient. I wouldn't have been able to stand that for a day. Why does he think you should do all the work - paid and otherwise? Why does he think he can sit around doing nothing and it's your job to serve him? Why does he think he can quit a paid job and not bother to find another?
he's been taking the p*ss for a long time. I'm sorry to say he has no love or respect for you, or he wouldn't treat you so dreadfully.
And you've now seen the light and told him to go. And he's realised his charmed life is at risk. If he leaves, he'll have to find a job, someone to do his washing and cooking and cleaning. He's lazy and doesn't want that effort, so he needs to reel you back in and ensure he keeps his feet under the table with you.
His entitlement and arrogance is so bad that he doesn't say 'I'm so sorry, I've been an idiot, would you reconsider me staying?' (even then the only sensible answer would no 'No!'. Instead he turns it around as though he's doing YOU a favour by giving you time to apologise to him and beg him to stay.
He's ridiculous as well as lazy and selfish. The man's a complete arse. You will be SO much better off without him. Your life will be easier. One less person to clean up after and earn money for. Imagine coming home to a tidy house every day! One less person treating you like an idiot. You can get rid of the resentment that must be building in you. You don't have to be a servant to an ungrateful, entitlement idiot of a man.
He is saying these things now because HE needs you 1000 times more than YOU need him. You are perfectly self-sufficient - you earn, you clean, you cook, you manage. He is a burden to you in fact. Your life will be loads better without him in it. Whereas his life will be alot harder without you - because he'll have to start acting like an adult and not an entitled 13 year old.
Stand your ground. You know - your gut knows - that you need ot get rid of him. He brings nothing good to your life, and a whole lot of work and resentment. You deserve better. Stay strong. Seek help IRL and on here. A better life is just around the corner!