How to get over a crush 😭

I’m 18, senior in HS. For a year and a half I’ve been off and on crushing on a guy, but I just had a dream about him last night (get your minds out of the gutter we were hiking in Scotland in the dream 😂) and now I’ve fallen hard y’all 😭😭😭. He’s a really great guy, runs a suicide prevention startup, basically runs student gov at my school, not bad looking either... but he wouldn’t be into me, we’re just acquaintances and run with totally different friend groups. UGH. Idk if he even has a gf. How do I get over himmmmmm