S1 E4, I'm done.
The episode where he's in withdrawal and hallucinating. I was already sick of the character's bullshit introspection, whining and self pity, but this has sealed it.
I fucking hate when a series devotes most of an episode to this kind of 'not really happening' horseshit anyway, and in this case the previous episodes have done nothing to convince me it's going to get better.