She had two options: first, she could walk away, saving her energy and not wasting her breath on him; second, she could openly confront him and point-blank tell him what he had done wrong.
And because Fenja had a lot of time and energy to spare, she chose the latter.
She fired all of her grievances at him so he could see where he messed up. How could he think he only made one mistake, and now he wanted to be the victim too, just because he was stupid enough to let Nadia trick him with one picture?
"You always sided with your mother and Nadia. It's not about one mistake; don't you dare to say that you are also the victim. It's stupidity…"
Fenja told him everything, every detail of the torment Nadia and his mother had put her through during the year he was away for the battle.
In the heat of the moment, all of her bad memories came forward, lined up in her mind, ready to be mentioned one by one.