How to get a girl out of my head?

So recently the girl I've been seeing for a while finally called it quits due to issues in her life and not wanting to drag me down. I'm still hurting from the whole situation, so I tried to carry on and move on by working hard, keeping busy at home, even started talking to some other girls. However, the next night I had a dream about this girl things ended with. It was just an entire memory of our third date and first kiss. I don't dream often, but I don't know why this happened and why I can't get her out of my head.
How to get a girl out of my head?
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