How can I stop my ex having power over me?

Basically my ex had and still has power over me. I am in a place of the getting over period where I can see what he done was wrong, (playing me), but I still want him back. Every time I seem to be getting on with my life I have little slip ups and he takes advantages of these.

How can I show him that he isn't in control anymore? I know the obvious thing to do would be ignore him or get someone new but I don't think these things would work with him. I want to do actively do something that will show him that I can do better than a cheating player like him. Please help
How can I stop my ex having power over me?
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