Killing Yourself to Live

"As soon as he gets the itch for a fix he's gone again, Reggie, with whatever else of value he can find in your home. Don't get involved, do you hear me? You'll just end up getting hurt. You can't be friends with an addict because you can't trust them and they'll take advantage of you." "Have a little faith in humanity, Sirius," said Regulus. "Remus isn't like that."