Pac Poker 1 Million-- Did I totally play this wrong?

[unglee]

Big tourny at Pac. About 500 left. Blinds are at 200-400. Hero has 5000 and BB (Villian) has about 8000. Villain seems aggressive, but has been quiet after losing a big hand about 5 hands prior.

Folded to me, and I raise to 800 (I know, should have raised 3x blind, but I was varying my style--dumb of me?). BB reraises to 1200, I call (should I have reraised?).

Flop comes: JT4, all diamonds. I have the A of diamonds in my hand.

BB raises 400, I reraise 800, he calls.

Turn: 6 spades.

BB checks, I push my remaining stack, BB instacalls.

My reasoning: I didn't put him on an overpair, and I thought any A or K would have been an out. A Queen would have given me the straight, and of course, any diamond gives me the A high flush.

Am I an idiot for pushing here? Also, did I give away my hand to him, allowing him to make this scary call?

Results in white:


<font color="white">Villain turns over 77 (no diamond!) and wins all my chips. </font>