His hand looks very little like a flush draw, so I don't think villain ever folds it.
Betting would be better than folding if you had some kind of read that he's calling with the nut straight but won't bet it. But there's no way to know that without history. Just like you can't know he's going to fold 63 of clubs if you bet.
Not that it really matters, but he's not bluffing 50% of the time.
If he does<ul type="square">[*]He's terrible[*]Hero would probably know that[*]If he's that bad, then he certainly isn't going to fold a flush[/list]