And he keeps telling me how unhappy and miserable he is without me. He says his life is empty now. He thinks that if he hammers away on that point, that I will somehow change my mind?

I have told him:

I don't love you anymore
my feelings have changed
I don't view you the same way as I once did
I can never trust you again - you ruined my trust in you
you cannot make me happy

And he STILL argues with me over this.