set vs possible flush, and facing push

[guns4show]

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Villain is 42/3, and 2.8 postflop aggro. Only 31 hands.

PokerRoom No-Limit Hold'em, $2 BB (5 handed) internettexasholdem.com

saw flop|<font color="#C00000">saw showdown</font>

Button ($40.30)
SB ($90.50)
BB ($136.40)
Hero ($100.00)
MP ($85.85)

Preflop: Hero is UTG with 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $4</font>, MP calls $4, <font color="#666666">1 fold</font>, SB calls $3.50, BB calls $3.

Flop: ($16) 8[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $15</font>, MP calls $15, SB folds, BB folds.

Turn: ($46) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets $66.85 (All-In)</font>, Hero folds.

Final Pot: $112.85

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You have to ask yourself: "Why am I checking the turn."

You should be $30 and bet the same on the river assuming no heart or straight card.