Abusers are too cowardly to feel their own pain. So they make others feel it for them.
When they have no one to abuse, they are forced to face their own inner emptiness. They hate being alone.
So either they make constant contact with you, or they avoid themselves by turning to booze or women.
My ex went no contact for a little while, but only for a short while. Now, any chance he gets to annoy me, he will. But if there is no way or reaching you, there is no choice.