How to get over somebody?

a couple of months ago I told my guy friend that I had a crush on him but he told me he didn't feel the same way back.

we are still friends but it's slightly more awkward now he knows I like him. before that we used to talk about if we had any crushes etc but now it's more uncomfortable to bring that up. I always used to grab his arm even before I liked him but now he doesn't like me doing that anymore. he was always a dry texter to me tbh but now he never replies.

I tried to pretend the whole asking-out thing was a joke but I confessed everything to his sister (who I am also friends with) over text and she showed him all those messages.

The thing is I still really like him and I can't stop thinking about him but I really want to get over it because I know there is no chance of a relationship. I really want to be happy with being just friends but I wish there was more. I keep lying to people about the rejection so they believe he likes me back - only my closest friends and his sister and him ofc unless he told anyone else know the truth.

I don't like anyone else in my school rn they are all assholes but I think he has a crush on somebody else and I really want to find out if that's true but how do I ask him casually?

I really really want to get over him but i don't know how

How to get over somebody?
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