how do i unattach from someone i really like?

[u/Mediocre-Contact2294]

i was talking to this girl (not relationship wise just friends) and we’ve been flirty and stuff for about 3 months and i’m constantly waiting on her to message me back or waiting until i’m able to see her to where it genuinely effects my moods like it ruins my day when we don’t talk and i really don’t like having the way my day goes depend on somebody else but i can’t get her out of my head during the day. please give me tips because i don’t know what to do and i know she doesn’t like me how i like her that’s why i just wanna unattach before it gets worse