In A Separate Peace why does gene feel that evil lurks in everthing he does?

Gene feel like evil lurks in everything he does because every time he did something, something bad came out of it. Gene feels like he is overshadowed and even controlled by his friend. After Finny's fall, however, Gene seems to be purged of his animosity and resentment, and he begins to blur the line between himself and his friend. Over the course of the rest of the novel, he tries to escape his own, pettier self by losing himself in Finny.