"He doesn't have any sets"-uhhhhh why not? 22 fits his line perfectly as does 77. In a lot of 1/2 games the passive fish will even limp 99. So IMO he has all the sets. These guys will even limp JJ-QQ as ridiculous as that sounds.

I would probably just give up after he calls flop. Depending on the player I might fire a second barrel on turn and then shut down if called. 1/2 players are so god damn passive and bad you don't need to get fancy.

As played this is 100% a fold on river.

thanks for the response , well he cheked back IP the turn on a drawy board and i dont think he is ever cheking his sets there . i agree i should give up after flop

If he is a fish you know he will call with almost everything so after the cbet its a check and fold after him betting to you. The cbet with 2 overs and a bdf it's standard but stop when no diamonds appear on the turn.