I've had mixed feelings about certain people dying. I think sometimes..."she had no integrity", and imagine her disintegrating into nothingness. It might sound weird, but it actually just releases some anger quite gently.
He could be contacting you if he isn't 100% sure he can't hook you back in. I would block him on everything, and roll your eyes if you see him on the street.
Don't waste any of your energy on them (I know, easier said than done)