I'm actually going through something similar right now; my friend that I liked has a gf and he expects me to support him. It's really rough, but as days go on its getting a bit easier. Just give it some time and everything will work itself out :) it hurts right now but it'll be alright in the end. Fighting!

what?!!! tk beritahu pn..sape dia tu?wasap me now

Honestly, the most common and well known thing would be to just wait it out. Let it pass you by. But, friend, I think it’s hard for people to get over crushes because that crush is their “habit”. When you get used to talking to someone, always thinking about them, then it kind of becomes a habit, a “ritual” if even lol. I think it’s best to be conscious of it. Always note when you start thinking about your crush again, when you want to talk to him again. It’s not like you should stop talking to him but when you are, what are your feelings then? Try thinking of it as if he’s simply a friend, don’t talk to him as if he’s your crush. There is no foolproof, 100% chance way to get over your crush but just being conscious about it can help you break away from it.

Time will heal. Try to distract your mind and get to know new people and then eventually you'll get over him. Stay strong

One time in my freshmen year, i was straight up crushing on a dude, we had most classes together and he kept telling me he liked this girl who already had a boyfriend. Funfact, he was friends with her boyfriend. He just wanted to know if she liked him or not. I wasn't even close to this girl and had to talk about the boy I was crushing on. I had one class with this girl. I had to put little hints that he was awesome at this and that. Over time me and my crush we're bonding and spending all of our time together, i even went to his house like everyday and he wrestled with me which I thought was weird. Anyhoo Finally after weeks the girl he liked was all like "do u like him, u keep talking about him."
I was oh but played it off cooly and said he was a good friend that hanging with me.
Finally i told him just to drop it and leave that girl alone, she's happy and with her boyfriend. He was sad and agreed. After that we still hung out even more. Then one day out of the blue he textes me to meet him after school, he had to tell me something important. So all day he kept lookinh at me in class and in the hallways. I got nervous and was like "dude is he gonna ask me out?"the boy had a damn look that was easy to tell.
So after school comes. He looked nervous and couldn't form a sentence and then he hits me with. "So I like a new girl."
I was like omg me.
"Do you think 'jamie' will go out with ne? I like her now."
My heart dropped and i was already tired of it. I told him i wasnt gonna help him with that and he needed to man up and just ask that girl. He did and she said no.
We we're still friends but My crush burned out. I didn't like him that way anymore once I started to see his bad points even if he was a good guy. I forced my self to see his bad points as a reminder for me not to like him again or waste my damn time.

instantly I think some real to myself. "Like boo boo, I am a young girl and it's not like me and him were gonna be together forever and married. It's just a crush and This was an experience, time to move on with some wine." I say that to myself lol. But to you, you seemed to really liked this dude. I'm not trying to be mean or sound mean, which probably does. Honestly just drop this muthaaaa, it already hurt you as it is. In time the crush will go away, i can't really say ignore it cuz that can sometimes make u think of him more. Heal from it, any ways you can find to heal from the pain, it will get better and sooner or later you'll be like " I wasted my time." And maybe you'll laugh about it or just straight up cringe from it.

Find a new crush!

It's frustrating, I know. Hope you can move on quickly.
https://www.asianfanfics.com/story/view/1288184/how-to-get-over-your-crush-romance-exo-sehun-baekhyun-chen-chanyeol-lay-ocandexo-bts-taehyung-btsv-twice-twicemina

Well, all these takes time..... As long as one dedicate their time from thinking into their jobs/works/hobbies..... It may slowly vanish.... But sad to say inside all of us, there will be one part that always feels like that, so dont lose faith in forgetting it... But just do your best....
Hwaiting ^^