Even if you make up the whole bed, you have to do one side, then go round and do up the other. Not going round and doing up the other is no effort at all certainly is is not extra effort.
istraighten my pillow, pull up the top sheet, and fling the duvet over it. My side done. Our King size is a tight fit, so I usually cant be bother to squeeze round the other side too. If it doesnt bother him, why should it bother me?
That's the real issue. In our house, it wouldnt occur to either of us to think the other meant anything by it because neither of us has strong expectations and there is no policy, other than when new sheets go on, I will do the corners, because they come apart when he does. was there ever a daily bedmaking standard agreed to, and he has ceased? Has he ceased because it was an unstated agreement, and he has just fallen into this habit? Or was it a clear agreement, with history, and therefore he must be doing this on purpose?
Though again, the fact that you have chosen to obsess over it is as worrisome as his not maintaining the previous habit (if it was a clearly defined expectation, not just a habit). There is a problem when you spend time and stress trying to read and interpret every minor action or inaction, rather than have a conversation. It may not be the problem you are imagining, but there is a problem.