Magic, It wouldn't be such a struggle if you would just drop the rope completely and allow him to wallow in his own self-absorbed pity pot.
How many times have we advised you to walk away or not engage in relationship talks? If he brings up relationship during working hours, change the subject or cut the conversation short. Keep the focus on the business during the day.
He's stuck and until he can figure out how to get out of his rut, he's going to continue spinning his wheels and the conversations about the two of you will be the same over and over again, i.e., circular conversations. How to change that? Stop the madness and end the discussions politely and go on about your business.
There always be some excuse not to finalize the business situation that involves you. Next month, it'll be something else, like selling a large inventory or needing more inventory. The man has it good, why would he change a thing? Nothing's rocking his boat and he's going to continue floating on the pond and enjoying his ownership of his business. Yep, I said "his" for a reason.
Drop the rope, no more conversations w/him about the relationship. Don't have discussions about what you determined three weeks ago, etc. He's a big boy and he can figure out why you are moving forward and if he can't, they he's dumber than I thought he was. Telling you that you've been cold to him is his way of roping you back into his drama...ignore comments such as this and keep moving forward.
I had to laugh at your comment about "insist we reconcile". Magic, I hate to break it to you, but you have not have any control over this man and to even think you could insist he do something tells me that you've not drop the rope one bit. Let it go, allow nature to take its course. He'll either wake up and want you back and treat you the way you deserve or he'll continue to wallow and you'll be on the edge of the pond years down the road watching him float comfortably in his boat. Magic, you and only you, are the only one who can change the dynamics of your situation. No one else can do it for you.