What's the secret to getting over someone?

Hello everyone. I feel pathetic asking this question. I feel like I need a slap in the face or something.

I’ve asked about this boy before. I met him a year ago, had an amazing date, but turns out he wasn’t interested. Fast forward to now… we haven’t spoken in a year, I haven’t seen him in a year, I blocked him on Facebook so that I can’t see him in my feed or Facebook stalk him. On his birthday I didn’t even wish him happy birthday, though I thought about it.

If you know me, I am a very independent person. I have many ambitions, I have some hobbies that I like to do, and I have an expanding social circle. I’ve been on some dates with other guys but I wasn’t interested in them. This boy isn’t ruining my life, but it would be nice to not think about him anymore.

There’s been times where I thought I was over him. Like for a few weeks I didn’t think about him at all, and I could for sure say I was over him. But then one day I just wake up and out of no where he’s in my mind again. This has happened multiple times, it’s like a never ending cycle.

I feel so stupid that a year later I’m asking about him again. I’m sure by now this boy I have in my mind is nothing like the real life boy. He isn’t thinking about me, why am I thinking about him?! What should I do?