Played set poorly/weak on river?

[fromak]

I don't think I bet enough on the flop? Also, I was so scared that the flush hit that I checked the river. Maybe I should've been the first to push but I just don't see what he could've called flop with. I was kind of tilting from getting outdrawn by KK the previous hand with AA so I weak called I feel like.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $10.75
Hero (BB): $10.00
UTG: $11.55
MP: $7.95
CO: $16.45
BTN: $10.95

Preflop: Hero is dealt 7[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/heart.gif[/img] (6 Players)
UTG calls $0.10, 2 folds, BTN calls $0.10, SB folds, <font color="red">Hero raises to $0.60</font>, UTG calls $0.50, BTN folds

Flop: ($1.35) 7[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $1.00</font>, UTG calls $1.00

Turn: ($3.35) T[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $3.00</font>, UTG calls $3.00

River: ($9.35) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">UTG bets all-in for $6.95</font>, Hero calls all-in for $5.40
Uncalled bet of $1.55 returned to UTG

Pot Size: $20.15 ($2 Rake)

UTG had T[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] ([Tc Kc] a pair of Tens) and LOST (-$10.00)
Hero had 7[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/heart.gif[/img] (three of a kind, Sevens) and WON (+$8.15)