If he has asked you to leave him alone then: do not call him, do not txt him, do not IM him, do not ask his friends about him, do not go see him, get my drift? Dont make him get a court order against you, depending on your relationship and how bad the break up was and how mad he is.
Drop off the face of the earth. Pretend you do not exist to him.
Two things can happen. He can either come running back to you, realizing what a great woman you are and he cant live without you, or you will never hear from him again.
Now, if you never hear from him again, yes it will hurt, A LOT! BUT do you really want to run after a guy that doesn't want to be with you? Give him time to think about things and figure things out.
You will not know if its the end and you wont know if he will contact you again. We are not psychics, but be sure to respect his wishes. Time will tell.