50NL: Pot control line check with TPGK

[O.T.G.]

Villain is 19/9/1.4 over 1300 hands. I don't know why I played this hand so weird, but this opponent seems to love getting tricky with me and I just felt like playing a smallish pot.

Full Tilt Poker No-Limit Hold'em, $0.50 BB (8 handed) Hand History converter Courtesy of PokerZion.com

MP2 ($65.30)
CO ($12.95)
Hero ($57.75)
SB ($36.40)
BB ($87.20)
UTG ($67.05)
UTG+1 ($25.85)
MP1 ($57.90)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls $0.50, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2.25</font>, <font color="#666666">1 fold</font>, BB calls $1.75, MP2 folds.

Flop: ($5.25) 2[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

Turn: ($5.25) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $3.5</font>, Hero calls $3.50.

River: ($12.25) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">BB raises to $81.45 (All-In)</font>, Hero folds.

Final Pot: $101.70

1)Was this a bad spot to check behind on the flop?
2)Once I hit 2 pair on the turn I thought I could get more value on the river from a slowplayed K or just a Q by just calling, but should I raise here?
3)Would you also value bet this river when the board pairs and the flush gets there?
4)I am never ever ever calling this river check raise against an opponent with these stats right?