How do you get over someone?

Ok so, I’ve had a crush on this guy right. For almost TWO YEARS. Idk who is playing jokes on me here but wtv. At the beginning my friend( who I’m not friends with anymore) always told me like bad stuff about him, that he is not over his ex or that he drinks and smokes (which is crazy for our age if u ask me but ok) and I still developed a crush for him. Like wtf how could I be so stupid. I decided one day to be little bold so I viewed his instagram story, and after that he viewed mine. I was so excited about that. Since then we always exchanged looks when we saw each other. But mind you we never even talked. I also always look at his reposts on Tik tok. And everything there was normal till today. I looked at his reposts once again and he reposted something about a relationship. Like “ oh yeah last 4 months been feeling great” sum stuff like that. And I’m sorry am I like the most delusional person on this planet but I’ve liked him for so long and you’re telling me he had a girl for 4 months now. So now I’m just trying to figure out how to get over this guy because I’m sick and tired of doing this especially because I know and knew that it wouldn’t even work out. So how do you get over a guy that has a girl now and probably never liked you, but you’ve been obsessed with for the last year? Anyone got some tips I could really use them 😔