O dear, I see that you've went into guilt trip mode while I was writing this, but here it is for what it's worth.
The reason he's able to bury his head in the sand is that he's been allowed to take no notice of what you have told him because you haven't followed through.
Once we start going back on our words and start breaking promises that we've made to ourselves or to others, we begin to chip away at our sense of self-worth. We lose respect for ourselves, and in turn others have little or no respect for.
Even now, you're turning yourself inside out wondering if he's depressed when this is one occasion when it's your needs that should be foremost in your mind. And why on earth are you considering calling him to demonstrate your 'maturity' when it's him that is being immature?
If you make the first move now, you're merely be demonstrating once again that you don't mean what you say.
You haven't made an unreasonable request, and it seems inconceivable that he cannot see that doing everything possible to alleviate any worries you may have about working full-time for a couple of days is a win-win situation for everyone including him.
He's stuck in the time-warp of his childhood where the household revolved around Father whose word was no doubt law. But time's moved on, and women today expect to have a partnership that is based on some concept of shared responsibility and equality, and where they are not compared unfavourably to Uncle Tom Cobley & all merely because they have aspirations and ambitions.
You've obviously been dissatisfied for some considerable length of time, and only you can decide if you want to go it alone. Personally, I'd give it all I've got to bring about the necessary positive change that will revive the marriage - but this means you need to make it clear that he needs to shape up otherwise he will be shipping out, and you're not going to get your message across if you cave in at the first hurdle.
If you can't get through to him any other way, it may take a separation for him to realise what he's got and what he's in danger of losing through his selfishness.
BTW, if you do decide to separate, I don't see any reason why you cannot remain on good terms with his nice family.