Heads up in 45-player SNG

Heads-up in a 45-player, $11 SNG. First place is $171. Second is $112.50.

Stacks:
Hero with 38170
Villain with 29330

Blinds: 600-1,200

Dealt to SB:6♥ 6♣
Preflop: Hero calls [600]

Villain was aggressive, so my plan was to flat call and then re-raise or possibly even shove preflop. I was more than happy to get it in preflop with a pair. But I really thought he would raise then fold to a reraise.

BB checks
Potsize: 2,400

Surprise! Villain checked. Messed up my plan a bit, but whatever.

Flop: 3♠ 7♦ 3♣
BB checks
Hero bets [1,200]
BB raises to 2,400
Hero calls [1,200]
Potsize: 7,200

I thought my hand was probably good. I made a weak bet hoping for a raise. When he min-raised, I altered from my plan of re-re-raising and just flat-called.

Turn: A♦
BB checks
Hero bets [3,600]
BB calls [3,600]
Potsize: 14,400

I don't think the ace helped him. If he had an ace, we would have got it all-in preflop. But this guy keeps checking to me and then calling, which is showing some strength. I'm starting to wonder whether I'm behind.

River: 6♦

Well, maybe I was behind.

BB checks
Hero bets [8,400]
BB raises to 22,130, and is all in
Hero calls [13,730]

Results:
BB shows : 4♥ 3♦
Hero shows : 6♥ 6♣
Villain shows trip threes.
Hero wins the pot (58,660) with a full house, Sixes full of Threes

At this point, Villain and a friend of his, who were observing, started spewing, telling me how stupid I was, yappity, yappity yap. But this guy slowplayed his way to oblivion He check-called the turn when a second diamond hit, then re-raise shoved the river when the third one came.

I checked his numbers online, and he's rolled through about $1,200 online while I'm up to almost $1,900 now, so I guess the numbers tell the story.