@mavis26,
Attachments fade in multiple ways :
- time
- prolonged or repetitive hurt
Now it seems obvious that neither of these are an attractive option to you.
Quicker ways to deal with the removal of an attachment involve forming other attachments -whether human, animal, passions, activities, or otherwise. So the new attachment doesn't have to be another person.
The point of non human attachments (ie. hobbies, exercise, sports, reading etc) is to give you something else to think about (other than him), and something to do that you enjoy (other than him)
Friends are very good for helping - especially if you have a number of them, they make you laugh, they go out with you etc.
Work is good - it gives you something to focus on. Actually anything that can require your complete attention is very good.
Basically, your much of people's 'attachment' to specific individuals is habitual (eg constantly thinking of him for little or no reason), and the best way to break one habit is to replace it with a different habit.