It is definitely worth reporting. What he is doing sounds very much like stalking. When you speak to the police it is worth raising your fears as you have done here, and asking what can and can’t be done. It is their duty to keep you safe.
One step at a time. Have you spoken to anyone at WA? They will be able to guide you to the next stage if you don’t want to go straight to the police. Please don’t worry about SS. I have had SS involved with me and the children. They couldn’t do much apart from refer the children to counselling. Along with the other billions of kids who need it.