Sometimes in the DR book it says you have to try another method. So if he is truly open to discussing it, put it in his court. Would you still be interested in scheduling a time to talk? I'm interested in hearing your perspective these days. Then he can say yes or no. Then go and listen to his perspective and validate it. Then you've done it once and addressed that complaint and you can go back to not pursuing. That's one option. Maybe someone has another idea.