In a real healthy relationship, you wouldn't have to ask because partners pitch in and do the work. And if something gets missed, they apologize before you have to ask because they know they missed something. I'm afraid you're shopping for bread at the hardware store. Whether you ask or not, whether you nag or not, he's just not capable of being part of a team right now. Hard as it is to accept, you are on your own. The only thing you have to decide is if you are okay with that or not.
L