Getting Raised on the Turn

[Nibster]

I really struggle with situations like this. This is without a doubt my biggest leak. It seems when I call down I always lose to trips or middle pair. When I fold I always feel like I'm giving the hand away.

Villian is 29/13/1.8 after 100 hands.


Party Poker 5/10 Hold'em (5 handed) pokerhand.org hand converter

Preflop: Hero is UTG with T[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">Hero raises</font>, MP calls, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (8.40 SB) 7[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, MP folds, Button calls, BB folds.

Turn: (5.20 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero ?

Do I call down or fold? What if villian was 40/20/2, would that change anything?