Just call, he would probably only call a reraise with a straight flush. Still his bet on the river doesn't make any sense, why bet a str8 flush? He knows you will bet the river anyway. And why pretend a str8 flush he knows you would at least call? So he has to put as much money in as he would if checked.
Bad play on the flop, either call and be prepared to fold if he pot bets a paired board on turn, or raise him more on flop (3-4$).