Why does Finny telephone Gene in Chapter 6 of "A Separate Peace"?

Finny telephones Gene because he wants to make sure that Gene is all right, and that their friendship is still intact.  The last time Finny had seen Gene was when Gene had visited him in the hospital.  Gene, overcome by guilt, had told Finny that he had deliberately caused the accident that crippled him.  Finny had refused to believe Gene, and the two had fought (Chapter 5).

When Finny and Gene finally connect again by phone, Finny is his old self, speaking with "friendliness (and) simple outgoing affection".  He asks if Gene has a new roommate, and when Gene replies that he does not, Finny assumes it is because Gene has not allowed them to replace Finny.  Even though this is not quite true, Finny is reassured that their friendship remains as it was before.   He tells Gene that Gene was "crazy" when he visited at the hospital, and apologizes for having "just a trace of a doubt" about Gene's loyalty to him (Chapter 6).