The thing is, getting out WILL become an option, the ONLY option for you, eventually. Basically, this will kill your relationship.
That's what you need to sit down and tell him.
You love him, you want to stay together - but you can see what's eventually going to happen here unless this gets sorted out. So if he wants to split up - carry right on. Maybe not this year, not the next but someday, and for the rest of your life...
Tell him you can accept his approach here - which sounds very much just like being a lazy inconsiderate albatross round the neck of your business and home life, which most people would NOT accept - but what you absolutely WON'T accept is you picking up the pieces from that and him getting to treat your mopping up after him with disdain. That needs sorting, probably with counselling. Or you will eventually split.
It's easy to see why he does it, by the way - and it's worth pointing out to him. He knows he's disorganised, lazy, the 'beta' partner. And of course, he doesn't want to be that, really. He could change it by making more effort, but that's hard (very hard really, for a naturally lazy person) - so instead he uses his attitude and responses to create an alternative 'narrative' for the relationship/partnership where HE is actually mature, laid back, reasonable - and you are neurotic, nagging, unneccessary. Which makes him feel much better about his shortcomings. It's quite a common thing. And it's eventually impossible to live with, as not only do you have the laziness/crapness etc., you also lose ALL respect for this person as you also end up despising the manipulative, shitty way they shaft you to try and disguise their faults, whilst being happy to lean on you to make sure they don't stuff up. Him doing this to you as business partner, as well as spouse, is doubly shitty and will destroy any regard you have for him doubly quick, I'd say.
Tell him this and tell him the writing's going to start appearing on the wall soon. Because even if you don't feel like that now, you will - and by the time you do, it'll be too late to save your relationship.