Did I cheat?

[deadmoney98]

So what do you do when playing in a casino and you see your opponents hole cards? Personally, I think is is your own responsibility to keep your cards concealed, but that people should not be actively trying to sneak a peak. Anyone else have thoughts on the matter, especially cause I see a lot of players pick up their cards way to high or otherwise make little attempt to conceal them.

The specific situation that leads me to ask...
Playing 1-2 NL at the Taj in AC. Unbelievably large stack to my left (maybe $2500) is playing LAG and a bit of a table coach. He raises UTG (could literally be any two), I call with QJ offsuit strictly for implied odds, everyone else folds. Flop comes Queen high, two clubs. I look over to see what my opponent will do and he looks at his cards, and I get a look too! He flopped an open end straight draw, which he eventually missed. I smooth call a flop bet, make a small turn bet after his check which he calls, and then raise him off a bluff on the river when he tries to represent the flush. So I had the best hand the whole time and the guy was kind of a jerk, but I basically get an easy $200 because I knew he had jack high. To top it off, I show my cards after he announced he thought I had the flush, and if anyone had stopped to think they would have realized my river raise was totally absurd. Thoughts?