@yorkie6 I wonder what you say to him / how you interact when he leaves crumbs and butter on the side? Or when you cook and he doesn't help?
My dh is not a great cook (and I love cooking) so the majority is down to me, but he CAN cook, and sometimes I want him to do it - ALL of it, the shopping, the cooking, the clearing up. I tell him what I want to eat (choosing recipes I know he can do). In other words I am really clear with him about my expectations.
My dh also has a habit of taking toast out of the toaster, not putting it on a plate but instead putting butter and jam on, on the counter. Drives me mad! But if he does it. I call him back to the kitchen when I notice it, I point it out and make him clear it up. Straightforward, no huffing and puffing on my part, just clarity about what's not OK.
I have to say I am not a clean freak, but I will not add clearing up after someone else to my list of tasks.
We both work full time and usually have a cleaner (we both pay for this). During COVID restrictions when cleaner could not come we had a clear list of tasks that needed done. One week I'd do upstairs and he'd do downstairs, the following week the other way round. And we both had to be actively involved in cleaning for the same length of time. We have different things that we notice - I spend more time on cleaning round taps and plug holes, he spends more time on windows and hoovering. But we were both doing it equally and together. I was probably doing more in the kitchen during the week (that's my domain and happy place so don't want it to feel grubby) but I'm fine with that.
Oh, and he does ALL the laundry (neither of us iron anything except for very particular items / ocassions).
However, I know that if were not assertive with dh, he would not notice the crumbs and butter on the kitchen worktop and I could easily become the resentful person clearing up after him. He would put off housework till tomorrow (or the next day, or the next week). And then get distracted by tidying his sock drawer.
For me it's a combination of clarity and kind assertiveness. Clarity and assertiveness about agreeing what needs done and when. But kindness and laughter if it's not done 'properly'.
I don't see those in what you have described. Sorry. But I hope this helps you to be clearer about what you expect your respective roles to be BEFORE he moves in. And if he doesn't pull his weight now, after you've discussed it, you have a pretty clear idea of what will happen in the future...