Bullied became a bully.
Poor Takagawa, didn't deserve this, now she will think men are sick fucks.
This will backfire, Nagaoka will help Takagawa getting through this and they will bond deeper than ever... I hope.
I too were in the similar position as Kurosawa, misunderstood intentions of someone who already was like Takagawa little closer to someone else, that broke me for some time but seeing things through like Kurosawa at one point, wouldn't do something so horrible out of spite. It's not easy, move on.