hmmmm i'd get the deck checked out- i notice there are 2 5 of clubs there, the one in your pocket and the one on the board- or is that just me?

hehe, sorry- not very helpful! This kind of thing happens, you made the right bet values, to put him off his top pair and even reduce his flush draw on the turn- there is no explanantion for the guys play...

However if you keep doing the 'right' things you will avoid these things long term...