Regulus,
The ones that break first are the ones that regret the most. I can hear them scream whenever a Dementor passes. Worse is when the screaming stops.
I know you were an idiot, believing the pureblood bullshit, following it like a good son. You probably went along with the torturing and killing, feeling so bloody proud and strong.
But you weren't not. You were weak and I know you'd have regretted. If you had been here, you'd have screamed until your voice gave out.
What keeps me sane in here is my hatred, anger, wanting revenge. Wonder what kept you sane out there. I know it'd not have helped in here, where you couldn't hide from yourself.
- Sirius