Recall Gene's realization right before the jump that there hadn't, after all, been any rivalry between him and Finny.
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I don't think Gene really knew what the truth was so no he wasn't. Gene was full of teenage angst, self identity problems and low self-esteem. His reasons for Finny's fall had to do with rivalry but one can't discount the myriad of other issues that Gene had going on including repressed sexual fascination he had with Finny.