You can only trust the one's who trust you.
"I like the man next door," my mother had said when Carl Fletcher moved in six years ago. "He's pathetic which means he keeps to himself." -page 24
I think this quote is very important because Helen's mom is describing herself in a way. She always kept to herself and didn't want to get in anyone else's business. I think she liked Carl because she saw herself as a reflection in him.