I open utg with 7d7h8d8h to 35. Button and both blinds call. Pot 137.5. Flop QcJc7s. Blinds check i bet 110 button folds sb folds bb calls. Turn is Kd for board QcJc7sKd with pot 357.5. Bb checks i check back. River is 8s. Bb checks i bet 155 he folded. Im wondering if he check raises river is it a must call with it being so obvious I dont have the nut straight??