It was the younger brother who witnessed the mc wanting to end his life.
it was the younger brother who witnessed it, plus trying to view things from the mc perspective this was literally his wake up call to himself. Him finally saying goodbye to those he lost and willing to step out of the depressive state he's been in for so long. that was his main focus, his first step to recovery. with all that in mind he obviously wasn't thinking too much about his worr choices because to him it makes total sense, he's finally saying goodbye to everything thats been keeping him in this state but to anyone else who isn't him then it sounds like something else so this was literally a miscommunication/misunderstanding
why would you phrase it like that to someone who's already witnessed you wanting to end your life?? it's traumatizing to say the least.