No hand history with villian.

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) from (Format: Bet The Pot)

saw flop|saw showdown

MP2 ($70.15)
Hero ($49)
Button ($96.30)
SB ($26.10)
BB ($50)
UTG ($14.30)
UTG+1 ($52.35)
MP1 ($21.60)

Preflop: Hero is CO with , .
UTG calls $0.50, 3 folds, Hero raises to $2.5, 2 folds, BB calls $2, UTG folds.

Flop: ($5.75) , , (2 players)
BB checks, Hero bets $5, BB raises to $12, Hero folds.

This happened to me a few times in the session. I started to think it might be a response to my continuation bets but I am still not sure how to play a hand like this.

What is your play on the flop? I hate getting involved in big pots when I only have TPTK. If I call his check raise I think I would be getting involved in a big pot. The problem is he could be playing back at me because of the CBs.