why doesnt finny consider gene a best pal, when gene considers finny one?

n A Separate Peace, the main characters are foils of one another. The plot is pushed along by the changing dynamics of their friendship. Their relationship begins to drift apart when their personalities clash. The changing dynamics of Gene and Finny's relationship and the revelations in Gene's personality are what move the plot along....At first, Gene seems to be awed by Finny. Although his friend is more athletic than him, Gene is proud of the other boy's accomplishments. In fact, he is proud to be so close to a well-loved student. He considers himself lucky to be considered Finny's best friend. It becomes evident that jealously engrains itself into the friendship, however. Gene soon views not himself to be the lucky one, but Finny. He views all of Finny's good fortune to be his own bad luck. Whenever Finny gets out of trouble by being blatantly obvious, he thinks of it as himself being inadequate and not as good as his friend.

I guess we should state the obvious as well. Finny's injury was a result of Gene's manipulation of the tree. Finny has to be angry at that.