Quote 4
"I told you. We just met by the river one day: that's all. Independents, both of us. We never made each other any promises. We never – " she said, and her voiced collapsed […] (18.14).
After Holly turns her cat loose, she tries to convince herself that she's happy being alone, but we see that this really isn't the case.
Quote 5
"[…] our understanding of each other had reached that sweet depth where two people communicate more often in silence than in words" (12.4).
This makes us believe that perhaps Holly and the narrator really do develop a true friendship. They reach a level of comfort that only true friends achieve.
Quote 6
"No, idiot. This is serious. Look at me. […] You might have been killed" (13.25-13.27).
After the horseback-riding fiasco, Holly displays real tenderness and concern for the narrator – she actually cares for him. And this is a touching moment between the two that shows us that Holly is indeed capable of friendship.