I think by answering I wanted to have communication with him, I miss him... I do understand that nothing I say will change his mind and was not trying to accomplish that in my response to him. I am just not sure how to engage him from here? How will anything happen if I just sit in silence? Is that better?
OK I am going to try to break this down a little bit. I understand that you miss him and that is quite understandable. You missing him is something that is in YOUR control. So that is something YOU can work on, and where detachment and GAL come into play.
As far as engaging him, I would not sit in silence but start working on how you can be a better YOU. Get a hobby, take a class. Read DB/DR, read the homework. Read threads on this board. There are lots of things that can keep you busy. I took some online classes for free on a site called coursera. What else do you like to do? So if he is going to get better you have to lead the way, not with words but with actions. YOU have to be the best possible version of yourself possible. What were things you did before you met him? What are things you never had TIME to do?