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How to become friends again with someone you told you like
Ensure you've given yourself enough time.
Once your friend has rejected you, make sure to give you and your friend some time to process and readjust. You both probably feel uncertain about what the two of you now have, so give some time to think things through.
If you usually spend every weekend with them or talk to them frequently via text, give yourself a few days apart and decrease your communication during that time. Keep in mind there's no set time limit for getting over someone.