Do not talk to him. It will do no good. It can only do harm.
The thing is he knows you are anguished. He knew that talking about leaving hurt you and actually leaving hurts you. Showing it, telling him it hurts, etc won't matter because he has already come to terms with the idea that he had to hurt you in order to do what he wants to do.
We LBSs think we can always reason with our WASs. But we cannot. No amount of begging, pleading, reasoning, trying to show them the hurt they are causing, or any other words will bring them back. Or make them stay. Or give them a change of heart.
That is why DBing is the only hope. He EXPECTS you to beg him to stay. When you do not it will plant a seed in his mind. "Why isn't she more upset? Why didn't she beg me to stay? Why is she suddenly okay with my leaving?" Those seeds of curiosity are your friends. Those are the things that make him become interested. Even if only at first if it is to try to figure out why you behaved differently than he expected. Interest in figuring that out can grow into other interests. And once he starts getting interested again in you and your life without him, that is when he might come around to missing what he once had and wanting to do the work to come back.
You have to let him go to get him back.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018