Okay, here's what I'm doing since I can't go dark either. I'm treating him like a stranger in my own house. I won't ask him to do anything, I won't expect him to do anything. If I have plans they will not include him. Nothing. I will act as if he's not there. I'll won't be rude, but I will be cold to a point. I answer with one word sentences (sound familiar?). Basically giving exactly what I've been getting.
And you know what? It's already working. Too bad I don't care anymore.