Overpair of TT & Possible Flush on Turn

[TemetNosce]

Ran into this hand playing 2/4 on Games Grid. Just sat down and have basically no reads:

UTG raises, MP1 calls, Button (Hero) re-raises with T [img]/images/graemlins/diamond.gif[/img]T [img]/images/graemlins/spade.gif[/img], BB calls, UTG calls, MP1 calls.

Flop is 9 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/diamond.gif[/img]
BB and MP1 check, Hero bets, UTG folds, BB and MP1 call

Turn is 6 [img]/images/graemlins/club.gif[/img]
BB and MP1 check, Hero who bets, BB calls, MP1 raises, Hero folds, BB folds

Was the Hero's fold too tight?