Exposing the card was a whole other matter. For anyone who's played with me more than a few times, you know that I'm quite level headed. When he showed the hand I was as tilted as I get which involved muttering that it was a bit of a dick move to show the Ace. But in the end, poker's about deception. He walks the line with that kind of play. I was more upset about the hand than the exposing of the card.
I hindsight, through analysis and over analysis, I realized that him showing me the Ace was almost beneficial to me, except I failed to see it. Him showing me the ace is his way of baiting me, "I just have the Ace", or "I hit the flush on the turn, now it's just a chop". But knowing him (as mentioned before, we play together), I should have identified that he was baiting me and thus folded. But that's thinking about poker to the nth degree.
If he had not shown me the Ace, I probably still call. After showing me the ace, I think there's a higher chance of me folding if I was able to recognize the signs. Folding here is not a bad move at all, just sucks to lose the money in the pot that I think is normally a chop 19/20 times.
Thanks for the insight everyone.