Yes, he has shown strength by betting out into 4 players on a coordinated board. That should let you know he likes his hand. You do not know where you are, the board is coordinated, you have a marginal hand, and there will be many scary turn cards. This is really bad play on your part.

Yes, fold to a half-pot bet. Min-bet... whatever, you have odds to chase a lot of crap there (runner runners, two-pairs). I would only raise that flop with a solid read on the pre-flop raiser.

How much did it cost you to get a "cheap showdown"? Aren't starting stacks on BoDog 1000 chips? Think about how much of your stack you're putting in on the turn - and you STILL don't know where you are in the hand.

You need to understand why this is a bad play before continuing playing more SNGs, or at least before calling raises with marginal hands.