Maybe it's time for a change. Could you write up some things you think have gotten better over the years, and some things you still want to work on. Then ask how you're going to proceed working on those things. Just sort of take stock of the relationship. How has it worked before, How is it working now, Is there a future? What are your goals with this. If you can't go through all that with him without getting a bad feeling, then it might be time for a change.

Good luck to you.