I am a cuckold, too. The situation you are both in is really difficult I think. You cannot stop him being a cuckold. If he is a cuckold he will stay. His desire makes your relationship out of balance, that's the fact.
If you think you can discuss points with him it's the wrong way. You need to take the power complete and show the direction. This means with consequences for him if he doesn't agree or doesn't do what you told. He needs you to be hard and straight.
Perhaps you will think he will suffer and starts to argue, but he will get calm if you don't jump in his argumentation rounds