He said that too? I thought that was only Jonahirt.
OP: Well you were kind of mean but at least you weren't mean "just" because she was addicted. She did something to provoke your angst and only then did you react with hostility (I think). Anyway, it's sad how people get addicted to this stuff.
EDIT: TBH, there's nothing wrong with being mad at someone who steals from you, furthermore it's not like you killed her.