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Q: The love spell that I casted on my crush made him not like me rather than like me ... what did I do wrong? Was it me?
A: This may be a classic case of trying too hard - if we do spellwork trying to manipulate another, it falls afoul of the Wiccan Rede - "An it harm none, do as thou wilt".
Love spells are a touchy subject - ideally, love spells open US to love, not try to rope someone else into a relationship. On the other hand, love spells will dispel "wrong" influences from around us ... so what appears to be a "pending" relationship may leave, since they are not in our best interest, despite what appears to be.
So, it appears your spell worked, just that the object of your affection wasn't meant for you.