CSFLW has provided you with the relevant act ..... To summarize it for you, see below
This type of order can be obtained against anyone who is not your family member or relative. For example, a flatmate, neighbour, workmate or other associate.
As you can see... the necessary elements to have an order made are not there in your case..
Have you considered blocking his email?
Peace & Good Behaviour Order
The Magistrates Court can issue a Peace and Good Behaviour Order requiring a person to stop any behaviour or activity that threatens to cause harm to you, your property or a person in your care. The order will stay in effect for a specified period of time.This type of order can be obtained against anyone who is not your family member or relative. For example, a flatmate, neighbour, workmate or other associate.
What do you need to prove to get a peace and good behaviour order?
To get an order you need to show that the offender has:- made threats of assault or physical injury,
- destroyed or damaged your property, or
- caused you have well-founded fear of them.
As you can see... the necessary elements to have an order made are not there in your case..
Have you considered blocking his email?