Turn play and your opinion?

[Str8Fish]

So there's this donkey, 3-betting lightly... last time I saw him do it he had 66 and called down on AKQ flop/turn. Let's call him Barney. Seriously fish, just a little more aggro. Called down on one board with 42o after it was 3-bet preflop, he cold-called in BB, hit his 2 and called down. Just an idiot.

4-handed

Preflop, Hero is on the Button with 8[img]/images/graemlins/club.gif[/img]8[img]/images/graemlins/spade.gif[/img]

1 fold, Hero raises, Barny 3-bets, BB folds, Hero caps, Barny calls.

Flop: T[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img] (2-handed, 9SB)
Barny checks, Hero bets, Barny calls

Turn: Q[img]/images/graemlins/club.gif[/img] (5.5BB)
Barny checks, Hero bets, Barny raises, Hero?!?!


I want some serious explanation on why you call or why you fold. I want to be convinced that what happened in real life was goot.