Gene comes to the conclusion that Finny is not concerned about school like he is. He feels that Finny is only cares about sports and having fun.
Gene decides to set aside his school work and go to the tree with Finny because he feels almost like he owes it to Finny. He feels that perhaps in interest of their friendship he put their fight behind them and go have fun at the tree.
Gene puts on Finny's pink shirt because he misses Finny being around all the time and he wants to become more like Finny. He feels like Finny, or the person Finny is, completes him. Finny is almost everything Gene wants to be. Finny is popular, easy-going, naturally good at things. Maybe Gene almost even wants to replace Finny.
Finny does not want to believe that Gene would possibly cause him to fall but he had thought about it. Finny even felt bad for suspecting his best friend of causing him to fall. Because of this Gene feels even more guilty than he had before because his friend fells bad for suspecting something that was the truth.
In the hospital room Gene comes to the conclusion that he has very little confidence and faith in his friend while Finny has complete faith and trust in Gene. Just one more thing to make Gene feel guilty.
