What hands are calling the flop?
Kx, Qx, JT.
What hands raise the turn?
Kx. QT if he's a tard.
I put him on Kx. Good 3bet. When he just calls. I rule out KQ, KT.

You should have bet the river. If raised, I have trouble putting in a 3bet.
The reason is that I know one of his cards is the K[img]/images/graemlins/spade.gif[/img] and the flush becomes more likely.