First, I might have raised on third. You have the strt draw and overcards to the board(1 jack dead). You may have gained some info from this later on about the 1 seat.

5th strt can only be a fold. You have nothing. If he has a flush you are basically drawing dead. if he has a pair of 8's maybe you're a slight favorite. I see no reason to continue here.

On river, be thankful that you caught a good card, basically as good as catching the strt. check and call and hope. Value bet? He has a strong looking board. I would not tangle with that. But you are not gonna fold your trips if he bets.