ATo Heads up on the flop...horribly misplayed?

[Somekid]

Villian is 63/25/1.37 through 50 hands.

I felt a little lost here. Betting the flop is standard, and I have odds to call the raise. Then I check the turn and when he checks behind I figure he has nothing. When the 6 completes the flush I figure he could have been going for a free card but also that if I check the river he's almost guaranteed to bet. Is calling here fine?

Party Poker 3.00/6.00 Hold'em <font color="#0000FF">(5 handed)</font> link

Preflop: Hero is CO with T[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, <font color="#666666">2 folds</font>.

Flop: (5.33 SB) 9[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero calls.

Turn: (4.67 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

River: (4.67 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 6.67 BB.