How to stop holding on to the idea of my ex boyfriend so I can find someone better?

My mom told me that the sooner I stop holding on to the idea of him, the sooner someone better can come along. And I really want to find someone better. But I don't know how to stop and let go, move on, forget him, and everything. How do I?
How to stop holding on to the idea of my ex boyfriend so I can find someone better?
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