[Notorious G.O.B.]

You're pretty well boned on 6th. Actually, you're pretty well boned on 5th, too, unless he's an utter donk. I don't see any reasonable hands you can beat or even expect to outdraw on fifth. JJ or JQ maybe, I wouldn't quite call those reasonable, though. I'd fold sixth, possibly fifth. It's hard to say, because if he is dicking around, we're well ahead on fifth, if he's not, we're almost dead.
Edit: Thought all kings were dead on fifth, guess he could have king in the hole. That's no more reasonable than JJ, though, considering your betting.