I have the same concern as Bizzle, because if he's as aggressive as you say that means he bets the flop consistantly as well, and him checking the flop in this situation raises a flag, the problem is that you filled up on the river which means there are only a couple of hands that beat you. The check on the flop would make me suspicious and I would pry just call the turn bet, on the river however it would be unfortunate to see a 6 and I think all my chips would hit the center. The other option would be the reraise on the turn as a feeler bet because he can pry only reraise you with one of th