CLAIRE: I still feel like you don’t understand why I was upset by what you did. You haven’t even apologized.
DANNY (Angry and loud): All right, all right! I’m sorry, I’M SORRY!!
CLAIRE (Shaking her head): You don’t get it.
DANNY: What the fuck do you want from me?? I apologized already! What, you won’t be satisfied until you have your pound of flesh??
CLAIRE: Your apology doesn’t mean anything to me when you obviously aren’t sorry.
DANNY: What do you mean I’m not sorry?? Don’t tell me what I’m feeling, Little Ms. Analyst! You’re not inside my head.

This interaction only serves to make Claire feel worse, of course, as Danny adds insults and crazy-making denial to whatever she was already upset about. Danny feels that Claire should be grateful for his apology, even though his tone communicated the opposite of his words; he in fact feels entitled to forgiveness, and he demands it. (He also considers it his prerogative to insist that she accept his version of reality, no matter how much it collides with everything she sees and hears; in this sense, he apparently sees her mind as part of what he has the right to control.)