Perhaps – perhaps I can tell him I've changed my mind … No, no, no. I cannot be with someone who takes pleasure in inflicting pain on me, someone who can't love me.”
-- Ana (Chapter 1 paragraph 27)

Importance: Ana misses Christian very much, and she is trying to figure out a way they can be together. At this point, she believes Christian cannot have sex without inflicting pain, and that she cannot abide that.

What do you have that I don't?' she asks sadly.
-- Leila (chapter 3 paragraph 47)

Importance: This is the first time Ana sees Leila, and she does not yet know who she is. Leila is obviously hurting, apparently believing Ana has taken her place in Christian's life. The situation with Leila escalates over the coming chapters until Leila is literally holding Ana at gunpoint.

I want to get my hair cut, preferably somewhere where you haven't fucked either the staff or the clientele.”
-- Ana (chapter 5 paragraph 41)

Importance: Christian has taken Ana to...