Remind me why I shouldn't miss him!
Better to remind yourself; make a list of all the unacceptable crap he pulled, and add to it as you remember things, and read it as much as you need to. It's a way to have your head overpower your heart for the time being, since we are conflicted coming out of these relationships. Also, send a text that says "Please do not contact me again", if that's what you want, and then eliminate any way of him contacting you. It takes extra effort at this point, and your resolve will be tested, but intentionally move towards what you want.
What's the first thing on your list?