[Andy B]

I like the guy who limped and three-bet with, uh, what do you suppose he had anyway?

This is uncomfortable all the way around. You played it fine, and I even think the bet on sixth was fine. I agree with Bremen that if you could have anticipated this kind of action, you should have at least considered folding on third. There isn't much money to be made with dead one-way hands in big multi-way pots.