Take a candle to represent the person who likes you - use a colour which you feel is appropriate. Take a candle to represent you - use a colour which you feel is appropriate (your favourite colour, or a colour that appeals to you). Place these candles in candle holders about 4 inches apart. Take a length of red ribbon, and tie the two candles together, saying:
 

 "This ribbon represents the love that ___(person't name) has for me.
I wish this person no harm,
But I wish to stop these feelings,
Leaving ____(person)____ free to find someone better suited to them."

Visualise a bond between the two of you, like the ribbon connects the 2 candles.  Take a red or pink pen/pencil or texta and surround the name with a love heart, saying:
 

"I wish that __(Person)___ finds love and happiness,
From someone who loves them back."

Place the paper under the candle holder holding the candle that represents them. Light the candle, saying:
 

"This candle represents ____(person)____"

Light your candle, saying:
 

"This candle represents _____(me)____"

Take a pair of scissors and hold them as if going to cut the ribbon, saying:
 

"I now break these feelings."

Cut the ribbon, and say:
 

"The feelings ___(person)___ had for me are gone,
So Mote it be!"

Visualise the bonds connecting you also breaking.  Bury all the spell ingredients in the Earth.  Repeat the spell as many times as is needed