I'm guessing he was playing with A8s, and caught the straight to win. Or he was playing suited rags and caught 2 pair. You calling his raise on the flop had him worried you had the flush, but the fact that you didn't reraise on the turn let him know he was sitting good. Same with the river. He might have tripped up a low pocket pair, but I doubt it.

So post the rest of the hand already so we can see if I'm a psychic or just full of shit