Villain is 22/1. I checked the turn because I didn't know whether OPP was calling with a 7 or not..how would you play this?

PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($10.25)
Hero ($13.75)
BB ($4.85)
UTG ($9.75)
UTG+1 ($4.25)
MP1 ($14.75)
MP2 ($9.55)
CO ($2.40)

Preflop: Hero is SB with 8, 8.
UTG calls $0.10, 3 folds, CO calls $0.10, Button calls $0.10, Hero completes, BB checks.

Flop: ($0.50) 7, 5, 7 (5 players)
Hero bets $0.4, BB folds, UTG folds, CO folds, Button calls $0.40.

Turn: ($1.30) 3 (2 players)
Hero checks, Button bets $0.7, Hero...