Poker Question

This happened to me on my last hand playing:

I was first to play.  1-2 NLHE.  Had about $180 on me.

Dealt: AA

Raised to 10.  2 callers.

Flopped: Q-8-4.  I believe two cards were suited but I don't recall which ones.

Big Blind bet $30

I raised up to $80

He went all-in.

Now, I've seen him make a big bluff before.  But overall my impression of him was that he was a good player.

I called, he showed 2 pair (he had Q8), I lost.

My question- should I have known better?  I was thinking he either had a flush draw or AQ- but was an all-in raise reasonable with either hand?