How to cut off feelings for a someone?

Long story short she doesn’t like me the same way. I still get the overly happy sensation from her texting me, seeing me in public, talking to me etc. . I want to be friends with her because I’ve never officially came out with the feelings but she knows it’s obvious. I looked up ways and the first few are hard it said “write down things to dislike about them” literally only thing is takes a little long to text back but other than that that’s it.
How to cut off feelings for a someone?
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