I call the flop, check the turn. Let's not get involved in weird situations with a danger board like that. Let's keep the pot has small has possible. He's probably checking / block bets the river is he does not have a powerful hand (JJ and such). I'd call about 40$ if the river is not a diamond or a card that completes a str8.

Back to the hand, I fold that c/r, I'm just not confortable enuff here.