Why do I still do stuff like this?

[Alobar]

SB is new to the table, button seems respectable

Party Poker 10/20 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises</font>, SB calls, Hero calls.

Flop: (6 SB) 8[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">Button bets</font>, SB folds, Hero calls.

Turn: (4 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>

On the flop I came up with the brilliant plan I was going to c/r any turn if the SB folded, which I dont really think I like because given the board and the situation I think I get called down quite often, and if he folds, it was likely a hand I had beat. Then the turn comes and I come up with the even better idea of donking, which I think is even more likely to result in a better hand calling me down and a worse hand folding, and given the board I dont think its unreasonable that a worse hand fires one more time. But omg! if he raises I can 3 bet and he'll fold!! :/