two pair facing raise by possible str8

Read: Villian is 27% for flops seen over 30 hands so far. He's tight but has been betting whenever he he might have the best hand even if its unlikely. ex betting 2/3 pot with a/10 on a 10/8/7//6/a board that has had betting on every street.


$25 NL Texas Hold'em -
(6 max) (Real Money)
Seat 6 is the button
Total number of players : 6
Seat 1: ( $67.50 )
Seat 3:( $25 )
Seat 4: Villian( $38.50 )
Seat 5:( $23.25 )
Seat 2: Pokertastic ( $27 )
Seat 6:( $24 )
posts small blind [$0.10].
Pokertastic posts big blind [$0.25].
** Dealing down cards **
Dealt to Pokertastic [ T/images/graemlins/spade.gif 5/images/graemlins/heart.gif ]
Villain calls [$0.25].
calls [$0.25].
calls [$0.15].
Pokertastic checks.
** Dealing Flop ** [ 5/images/graemlins/spade.gif, 9/images/graemlins/spade.gif, T/images/graemlins/heart.gif ]pot:$1
checks.
Pokertastic bets [$1].
Villian calls [$1].
2 folds.
** Dealing Turn ** [ 6/images/graemlins/club.gif ]pot:$3
Pokertastic bets [$2].
Villain raises [$5].
Pokertastic calls [$3].
** Dealing River ** [ Q/images/graemlins/club.gif ]pot:$13
Pokertastic checks
Villian bets [$7].
Pokertastic folds

should I have folded on the turn or bet on the river, maybe even raise the turn?