Nice read. Don't think I could lay it down but I understand his betting out the trip Aces rather then slowplaying. You obviously liked your hand preflop with a big raise over an UTG raise. He could probably assume you had AK/KK/QQ. 2 of 3 of those hands hit that flop BIG and would be tough to laydown.

You didn't say but I'm guessing you checked your trips, or did you bet and he came over the top?