Villain is 160 hands & 25/16 3bet 4% 50% aggression. Seems like a reg, nothing special has come into play so far that comes to mind.

$0.10 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 3

UTG: $10.16
Hero (MP): $10.00
CO: $18.03
BTN: $20.36
SB: $9.10
BB: $25.90

SB posts SB $0.05, BB posts BB $0.10

Pre Flop: ($0.15) Hero has K K

fold, Hero raises to $0.30, CO calls $0.30, BTN calls $0.30, fold, fold

Flop: ($1.05, 3 players) J 7 4
Hero bets $0.52, CO calls $0.52, fold

I've got 2nd nut flush & overpair. I think I sized this very badly. Either bigger or not at all is what I'm thinking now. $1.30 i'm thinking now would have told me more. I've priced this wrong. Comments?

Turn: ($2.09, 2 players) 4
Hero bets $1.56, CO calls $1.56

Board pairs gives a chance of FH for someone now in addition to the flush. Just a call makes me think he's worried about something or drawing or simply sucking out. I can't really gauge.

River: ($5.21, 2 players) 6
Hero bets $3.90, CO raises to $7.80, Hero ??

This makes me feel I'm beat. It's a good time for a missed draw to bluff the pot but I've not seem him show a bluff yet. AsJx would have hung around but I doubt shove at the pot like this. Air or good flush draw?

I think I"m beat here due to the change in the play & the size.

Thoughts?