Quote 1
"Boy, that's rotten. And you meant to be her friend. What a bastard!" (15.4).
This reveals to us Joe Bell's definition of friendship. He is appalled that the narrator thinks Holly is really involved in the mess with Sally Tomato. For Joe, true friendship is the complete belief in a friend's innocence.
Quote 2
"You take a man that likes to walk, a man like me, a man's been walking in the streets going on ten or twelve years, and all those years he's got his eye out for one person, and nobody's ever her, don't it stand to reason she's not there" (1.32).
Joe Bell desperately wants to recapture the past, to go back to the chapter when Holly was in his life. He spends his days looking for the woman who can carry him back to a different time.
Quote 3
"Sure I loved her. But it wasn't that I wanted to touch her" (1.35).
Joe loves Holly in a way that doesn't require sex. He loves her without it being about a physical relationship. He loves her just for her.