please explain

can someone please explain if this is a deliberate thing he did, or if he is a wanker, we had been having a good heads up, all was serious, no donkey plays until this, my image was set as a solid tight player or at least i thought, I deided the time was right for a good bluff

PokerStars Game #6494701045: Tournament #32971709, $3.00+$0.40 Hold'em No Limit - Level VIII (200/400) - 2006/10/02 - 00:17:08 (ET)
Table '32971709 1' 10-max Seat #3 is the button
Seat 3: bnelson50 (8460 in chips)
Seat 6: Jason_Davies (6540 in chips)
bnelson50: posts the ante 25
Jason_Davies: posts the ante 25
bnelson50: posts small blind 200
Jason_Davies: posts big blind 400
*** HOLE CARDS ***
Dealt to Jason_Davies 8♥ 3♦
bnelson50: calls 200
Jason_Davies: raises 800 to 1200
bnelson50: calls 800
*** FLOP *** 2♠ [Tc] 4♦
Jason_Davies: bets 800
bnelson50: calls 800
*** TURN *** 2♠ [Tc] 4♦ A♠
Jason_Davies: bets 1200
bnelson50: calls 1200
*** RIVER *** 2♠ [Tc] 4♦ A♠ 6♠
Jason_Davies: bets 1200
bnelson50: calls 1200
*** SHOW DOWN ***
Jason_Davies: shows 8♥ 3♦ (high card Ace)
bnelson50: shows Q♣ 5♣ (high card Ace - Queen kicker)
bnelson50 collected 8850 from pot
*** SUMMARY ***
Total pot 8850 | Rake 0
Board 2♠ [Tc] 4♦ A♠ 6♠
Seat 3: bnelson50 (button) (small blind) showed Q♣ 5♣ and won (8850) with high card Ace
Seat 6: Jason_Davies (big blind) showed 8♥ 3♦ and lost with high card Ace

Clearly your opponent here was a donkey, just calling down with Queen high. If he had thought you didn't have anything, he would have raised. This may have been avoided if you had pushed harder. If I counted right, there was 2450 in the pot going to the flop, and you bet 800 (33%)? Then on the turn there's 4050 in the pot and you bet 1200(30%)? Again, on the river there's 6450 in the pot, and you bet 1200(19%)?

I would reccomend bets of 75% to 100% of the pot size to try and take down a pot like this. The only exception being if you are sure that your opponent is on a draw sometimes I employ the strategy of betting small on the flop/turn and checking if a card comes that would complete the suspected draw, then I'll take down the pot with a big bet on the river. It is risky as you have to be aware of what cards can make their draw, and bail if it comes out.

Yes. Donkeys are hardest to bluff. You never know if they'll call down or fold the river. If I get calls from a donkey without at least top pair, many times I hit the brakes and check-call. It's better to wait for them to call down when you actually have a hand. Hit the brakes without one because you know they'll do it again.