This situation has happened to me twice today. No read on villain, as it's during my first orbit at the table. What do you do?

Poker Room skin
Limit Holdem Ring game
Limit: $2/$4
10 players


Stack sizes:
UTG: $77
UTG+1: $101
UTG+2: $53.20
MP1: $128.60
MP2: $166
MP3: $96
CO: $82.20
flafishy: $97
SB: $113.50
BB: $200.50

Pre-flop: (10 players) flafishy is Button with
UTG calls (1.5:1), 5 folds, CO calls (2.5:1), flafishy calls (3.5:1), SB calls (4.5:0.5), BB checks.

Flop: (5SB, 5 players)
SB checks, BB checks, UTG bets, CO raises, flafishy 3-bets, 2 folds, UTG calls (11:2), CO caps, flafishy calls (15:1), UTG calls (16:1).

Turn: (8.5BB, 3 players)
UTG checks, CO checks, flafishy bets, UTG folds, CO raises, flafishy calls (11.5:1).

River: (12.5BB, 2 players)
CO bets, flafishy calls (13.5:1).

Results:
Final pot: 14.5BB
CO shows QS KD
flafishy shows 7H 5C

I thought there was a good chance I was beat. But there was a bit of doubt, and I couldn't let it go. I questioned whether he would have raised the flop twice with a Q, thought he might have the case 5.

I'm not so sure I donked this one. But I'm still pissed at myself for a similar hand earlier where I donked off a few bets even though I knew without a doubt that I was beat.

Yeah, I'm not getting away from it, but I'm not betting the turn unless opponent is a 100%CS who would actually call here with a weaker hand(I've played with a few and still remember their names and faces). And, unless your guy is a complete donk/maniac who will raise everything or you have an image of a maniac, no one is raising on the turn in a FR game when they don't have either a five or queen.

Check that turn...no reason to bet. Anyway, I would probably check the turn(like CO did) because I want opponents to maybe catch up with a flush draw or make them think I am on one.

BTW, I don't really like the limp here even on the button. 75o is really marginal.

Interesting that the CO capped the flop though with a paired board and only KQ. Still, I can't really put him on anything but a queen, a five or a badly played AA, KK. And I would say the chances of the check raise on the turn make AA or KK almost impossible.