[sh58]

i have found there is a kind of fish that i encounter often on party 100NL (this is where i play too) that c/c flop and turn, never bet or raise, but then they lead out almost everytime on the river. the most common line is:
you raise PF, they call. they c/c flop, you check behind turn, they bet into you on river thinking you missed.

if you look at there AF stats they are usually like F:0.7, T:0.5, R:2 or something.

this situation is a little different, as you have shown no weakness. it's a tricky spot, and the flush draw hit, there are straights and several 2 pair hands. i'd fold with the info you have given. i think he would play the flush the same way.

btw - i'm an obsessive bluff catcher agaisnt these fish, but this doesn't look like a bluff

edit: oops, didn't notice that we had counterfeited the 2 pairs. i still fold tho