"My brother asked to stay over for a few more nights again. I told him at the very least, you'd probably kill me if he did."
No, not you. I love you, I would never (intentionally) hurt you. Your brother on the other hand, mm, yeah, that is a distinct possibility.
Okay, letting him stay here for a while as he got back on his feet? Fine. But you know what, it's been six months, we've had our living room back for less than a week (I still haven't had the chance to clean it) and I know you want him here as much as I do (which is to say, not at all) because when he's around we both fall back into old habits and mindsets that are fucking awful and he makes you fucking miserable and I don't want that. Let him stay gone