That is a very large raise for this game...smells like a set trying to push out any possible draw. I don't think a fold on the flop is out of order.

Turn bet is very suspect. Villian is either very unsure of his hand (why wouldn't he check?) or not at all afraid of the draw hitting (Filled up). It's tough to let yourhand go getting 5 to 1 odds...maybe call turn and try and get to a cheap showdown (?). Tough spot for sure...please post results - interested to see how it played out.