Raise the river with half goods and fold to a threebet?

[aflaba]

Player is TAG

Party Poker 5/10 Hold'em (6 max, 5 handed) converter

Preflop: Hero is Button with Q[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, BB calls.

OK, so he has a strong hand but not strong enough to cap

Flop: (8.40 SB) 5[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, BB calls.

OK. Not a middle PP else he would have raised. Overcards? AX?

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

Ah, that hit him. AK, KQ, (KJ)

River: (9.20 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, Hero calls.

OK. the river didn't go as planned. The plan was to fold to a threebet because that would mean he had AK. I abandoned the plan and called. It felt bad. Also it might have looked like a bluff because of the 6.

Final Pot: 15.20 BB

I should just have called right?
Raising + folding to a threebet bad?

Oh my, oh my, when will I stop sucking.