50NL Marginal overpair line checkup

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($80.65)
SB ($70.35)
BB ($17.80)
UTG ($49.50)
Hero ($49.50)
CO ($40.80)

Preflop: Hero is MP with 7, 7.
1 fold, Hero raises to $1.75, 1 fold, Button calls $1.75, 2 folds.

Flop: ($4.25) 5, 2, 3 (2 players)
Hero bets $3, Button calls $3.

Turn: ($10.25) 6 (2 players)
Hero checks, Button bets $8, Hero folds.

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Villian is an unknown.

How's my line here?

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