25NL 6Max: KK - Aggro 'till Turn scares me. Weaknessaments?

[BuddyQ]

Villian is 42/8/2.0 after 80 Hands. I also have a notion that he was tight Post Flop in a few prior hands.

Full Tilt Poker
$0.10/$0.25 No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
CO: $24.70
BTN: $34.20
Hero (SB): $24.65
BB: $24.8
UTG: $28.60
MP: $24.30

<font color="black">Preflop:</font> K K[img]/images/graemlins/spade.gif[/img] ($0.35, 6 players)
UTG folds, MP folds, CO folds, BTN calls $0.25, <font color="red">Hero raises to $1.25</font>, BB calls $1, BTN calls $1

<font color="black">Flop:</font> 4 7 Q[img]/images/graemlins/heart.gif[/img] ($3.75, 3 players)
<font color="red">Hero bets $3.75</font>, BB calls $3.75, BTN folds

<font color="black">Turn:</font> 4 7 Q[img]/images/graemlins/heart.gif[/img] [3] ($11.25, 2 players)
Hero checks, <font color="red">BB bets $5</font>, Hero ???

Dispite my cowboys, because of my read, I'm gunshy here. Why did he call the Flop bet? With OverPair and Flush draw should I push? Was the Turn check bad?

The only thing I see beating which he calls with is AQ. I see lots more hands where I'm toast. If I Push and he has me, I curse myself for not heeding my read. If I Check/Call down and lose, I curse myself for fishily paying off his value bets. If I fold I feel nitish and dirty. My emotions are at war with themselves. HELP!!! (Don't go broke with a pair? Wait for better spot?)