How should I end things with my ex?

We have been broken up for a month going back and forth as "friends". he's made me cry many times and blew me off on the 4th of July and left me completely alone, which was the last straw for me. I know I do not want to be with him and I'm ready to meet someone who is good for me. He texted me saying "Did you mean it when you said you want me to stay away from you?" I want to be mature, keep it open for us to be JUST friends in the future after we heal, and make it clear that I'm focusing on myself and moving on. What should I say?

I don't want to be ego-filled, rude, etc, I just want to be to the point and confident.
How should I end things with my ex?
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