50 NL...I folded a boat

[llamage]

I understand that 90% of the time, I go broke here. But something just didn't seem right about villain's line. I think he had a higher boat. My thought process:

He's been pretty loose and agressive on the flop. However, he didn't bet the flop, so that indicates something fishy...

If he had AK on the flop, wouldn't he bet to protect?

Furthermore his raise on the river says : I can beat trip 7's...

What do you guys think? I wouldn't normally do this, but for this one particular hand

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($89.25)
BB ($66.90)
UTG ($67.15)
MP ($50)
CO ($49.30)
Button ($62.15)

Preflop: Hero is SB with 4[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.50, <font color="#666666">2 folds</font>, <font color="#CC3333">Button raises to $3.5</font>, Hero calls $3.25, <font color="#666666">1 fold</font>, UTG folds.

Flop: ($8) 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Turn: ($8) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4.5</font>, Button calls $4.50.

River: ($17) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $10.5</font>, <font color="#CC3333">Button raises to $35</font>, Hero folds.

Final Pot: $38