I had kept my promise; I had found him (19.1).
Although he doesn't have to do this, the narrator keeps his word to Holly and finds her cat. It seems he feels that loyalty is a part of friendship, too.
"I don't think anyone will miss me. I have no friends" (13.7).
Is this Holly feeling sorry for herself or is she just speaking the truth? Either way, she seems a bit saddened by this realization and we get to see a crack in her armor.
"But there's a horse, my darling old Mabel Minerva – I can't go without saying good-bye to Mabel Minerva" (13.2).
It's much easier for Holly to form attachments to animals than to people. This horse is her friend, a thing she loves and holds dear to her heart.