there is no reason to continue talking to this person.
they are no longer an active part of your life.
You've already removed yourself entirely so you need to stick with it. I know it isn't easy but it is what is best for you...and for him too. He just doesn't realize it.
I'm having a tough time w/ this myself. Talking to my RAH during the day is just normal, now I'm trying to detach and it's really hard. I'm trying to keep busy, and not think about it. I need to just start turning off my cell during the day.