[dickkemp]

first their is something wrong with your post
if he posted small and you big you had position on him entire hand which means he checked the turn and you bet a large amount and then he just pushed the river.
and this omaha i dont see to many people pushing a straight into your flop raise and big bet on turn. anything he could possibly push there was a boat and you haveing the worst possible boat means you are beat. i dont agree with folding so dont bet the turn and let him lead into on the river. that way when he does lead into the river maybe he will thought you were stealing flop and the river bet will be much more likely to be a bluff.