Straight facing a raise river decision

In a dream I was in a cash game against Antonio, Hellmuth, Dwan, and Safai and for some reason we were playing 1/2 and were all 1000 bb deep. I was on the button with KJo and open to 6 dollars. So folds and Antonio calls. Flop comes KJ8 rainbow. I bet 8 he calls. Turn is the 9h bringing on a flush draw with the hearts. I continue for 18 dollars and Antonio decides to call again. River turns my dream into a nightmare and is the Th and everything gets there. For some reason he checked and I randomly decide to bet. At this point Antonio flatted and showed the 72hh and wins with a flush. The actual hands are irrelevant but let's say I had a straight in this spot. What would you do facing a raise on the river.