Why does Gene cry in chapter 5 ?

Gene gets the news that Finny has finally gotten better, and can have Gene to visit him in the infirmary. Gene also learns that Finny's leg suffered a nasty break, and that he will no longer be able to play sports while at school; Gene cannot believe the news, and bursts out crying. The doctor urges Gene not to be sad in front of Finny, and to help him face the truth about his injury once he is out of the infirmary.