Between talking and not talking to Elsa; between exams and class, interning and a real job, Anna spends more time crying than not.
Elsa doesn't notice that she doesn't coming home some nights (if she does, she says nothing). Those nights, Anna can't return, instead finding comfort in the only person who won't judge her. Curled in his arms, she breaks down completely.
"I tore apart a family, Kristoff," she sobs, and he can't do much but hold her because there's no comforting Anna about this.
No one can really comfort her about family.