re: Poker & Set of aces versus possible flush
When I am looking at a posible straight or flush, I may not over value just top pair but, with trips I will push hard to make them call bad odds
or fold. I would rather take a little now, when I know I am ahead, than get beat on latter streets. (Even though you had 7 outs on the flop, and 10 on the turn, to improve to full house or quads.) A pot bet on the flop, may have given you a better read on what he was holding. A call could have meant maybe A-x, 7-7 etc. (unless you knew he was a calling station. and if he's not too agressive, a check calling on the scare card can save you some chips sometimes, especially if he didn't hit and thinks you might be slow playing) Sometimes "bear gets you" but you can't let off on the flop, unless you have a monster. "A-k" with a A-A-K flop" actually had that, and almost felt 2 seconds simpathy for the guy who lost his chips with K-K
P.S. Since you observed him as fairly tight and most likely didn't see him making several possible steal attempts, I would put him on a Jc-10c or Qc-Jc and worried you might be holding a Kc and not wanting you to see the river in case it was another club.