Medusa had a crush on Poseidon in some early interpretations.
While Medusa is famously known for her tragic tale and monstrous transformation, the context of who harbored romantic feelings for her requires careful distinction.
Based on the provided reference, Medusa, in the early books (likely referring to fictional adaptations of the myth), is depicted as having a crush on the self-absorbed Poseidon. However, the reference also mentions that Medusa later realizes Dionysus likes her.
Therefore, to directly answer the question, the prompt is slightly misleading. Medusa had a crush on Poseidon. Dionysus, according to the reference, liked her.