You can give him a push so that he either leaves you the hell alone so you can get over him or so that he asks for you back and you can do that by completely ignoring him or actually asking him WTF his problem is and does he want to continue on in an exclusive relationship.
You confuse one another with the half-assed demoted state of "just friends." Make it either all both in or all both out and staying out.
My suggestion: You don't need this demoted state of "just friends" and you should have never agreed to it so tell him that keeping him in your life in this half-assed friendship is stagnating you from moving on and so you will not be answering anymore of his contact unless it has a subject line of "I made a mistake and I want you back." You best make sure that's what you want first though and for goodness sakes don't wait around hoping to receive that subject line... Just get on with your life without him in it.
Cut the cord.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion