Flopped flush but board pairs

[Abramovic]

I dont think this was such a great slow play on the flop now. I had no reason to believe him for a full house on the river until he moves in over the top. Should I get away from it?

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.15/$0.25
6 players
Converter

Pre-flop: (6 players) Hero is CO with 8[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/heart.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $1</font>, Button folds, SB calls, BB calls.

Flop: A[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img] ($3, 3 players)
SB checks, BB checks, Hero checks.

Turn: A[img]/images/graemlins/club.gif[/img] ($3, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $1.5</font>, SB calls, BB calls.

River: 3[img]/images/graemlins/spade.gif[/img] ($7.5, 3 players)
<font color="#cc0000">SB bets $2.5</font>, BB folds, <font color="#cc0000">Hero raises to $10</font>, <font color="#cc0000">SB raises all-in $18.5</font>, Hero calls.

Results:
Final pot: $44.5

[Jigsaws]

AAAAAAAAAAARRRRRGGH FLOP CHECK. MY EYES, IT BURNSSSSS.

Okay, seriously, promise to not do that again? The whole hand plays differently if you just make it $2.5 there.

[Abramovic]

I promise, big mistake I concur.