 I don't know if this is the right place for this, so if not let me know.
 Also I don't know how to talk about this in a concise manner so apologies for the long post.

So the story starts 9 years ago. I was a high school freshman, with a crush on a girl. I was head over heels for her, but lacked the confidence to actually ask her out or make a move. So, we had a year long flirtationship, and then she moved. We remained friends, but eventually we lost contact. All sounds fine and well, except I had been obsessed with this girl. I would dream about her, fantasize about her, etc. I really struggled with regret about my choices I made and that I blew my chances with her. As time went on, I dated other girls, but I was still never able to let go of my past. I would continue dreaming about this girl, longing for a chance. I knew it was unhealthy, so I stop following her socials, and I kept my obsession to myself so I wouldn't come across as creepy. A few years went by, and my constant obsession faded. I found myself in a long term relationship with someone I loved. And yet, about twice a year, I would get these waves of obsession. It would start with a dream, and then no matter what I did for weeks I wouldn't be able to get this girl out of my head. I would check her socials, dream, regret. When I would close my eyes, all I could see was her eyes, piercing my soul. Eventially it would fade and I could return to normal. More time passes. About a year ago, 8 years since I met her and about 6 since we stopped talking, I finally moved past the obsessions. I was freed, or so I thought, until a few days ago when I had a dream and it all started over. I'm in a relationship with a lovely woman who I hope to build my life with, I'm in a new city, my life circumstances are different. Not to mention, I know full and well the girl I can't get out if my head isn't a reflection of the actual woman. It's a warped creation, that likely wouldn't even be satisfied if she came back into my life. I know it's not healthy. But, I also know better than to tell anyone. I don't need people to see me as creepy or strange. I don't need my current girlfriend thinking I'm not happy with her. But most of all I don't need this ghost in my head. My question to you all is how do I escape?

How do I get her out of my head?