I can't believe any of the words he says to me since he has lied so much in the past about his drinking.
That is exactly right. Your instincts are spot on.
His recovery absolutely positively does NOT depend on you returning to PA. It depends on him and him alone.
Stay in California with your support system. If you go back to PA odds are pretty darn close to 100% you'll be back in the exact same situation you left.