[Sandberg]

Raise the flop. The whole rest of the hand plays out differently. At that point, the villain could easily have been betting into on a draw (str8 draw? Have no idea if he has a flush) or a 5 often enough that the raise is for value. Plus, it's an oppurtunity to take a free showdown.

Raise the flop
check the turn (If it's checked to you)
call the river.

The way you played it, you should fold the turn.

The way you played the turn, just call the three bet on the river.