Here's my take:

If he was willing to play a flush that aggressively, make a note on him. It seems to me that is more likely he wants to discourage a draw.

Villains likely holdings seem to be, AQ, AJ, AT, TT, KK, QQ, JJ, or 77.

When the turn comes the K[img]/images/graemlins/heart.gif[/img] I'm raising the turn. It's a scare card for him so it may give him pause but I don't think he's laying down a set here. Get your money in before a 4th heart hits the board.

Thoughts?