400-800 hand

[bruce18lee]

I played this hand in a good 400-800 game at Bellagio last night. John D'Agostino (sp?) is to my immediate left and has called or reraised almost every single time I have raised preflop. This may just be a coincidence but I'm not sure. My image (as far as I'm aware) is relatively tight...I have been raising maybe what appears to be very frequently preflop, but all have been the typical raising hands, nothing out of line. John has cold-called my UTG raises w/ hands as weak as A5s next in and has been playing very well postflop.
I don't remember the exact cards in the hand but the important details are here. I raise JsJd UTG, John coldcalls, a loose BB calls. Flop is KQ5 w/ two hearts. Checked to me, I bet, John calls, and the blind folds. Turn is an irrelevant small card (maybe a 3 or something). I bet and he calls. River is a third heart (8 maybe?). I check, John bets, and I fold.
Any thoughts or standard?