I thought it was clarified at that time, he had even repeated back what he "understood" me to say at that time, however over the past several months he seems to have edited his understanding down to just that portion of what I said....and focused on that as a reason not to step up.
I know you are very experienced in this sort of thing, and I don’t mean to imply his misunderstanding has anything to do with you. He should try to proactively confirm that his understanding is what you meant. But if he thinks he already understands, then why ask? The fact that over time he has mutated a prior understanding into something different may be an opening for you to better understand him, and why he does that. I would think that if he is sincere in working on he R, then he would change this, but since he hasn’t, maybe he is not aware of it and needs some help?
That type of attitude from my W would have helped me, rather than being accused of purposely twisting things around. (I’m not saying you do this.)