NL100 set 5er in unraised pot

[VinniePaz]

No-Limit Hold'em, $1.00 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

SB ($148.45)
Hero (BB) ($116.15)
UTG ($15.50)
MP ($103.15)
CO ($11.50)
Button ($238.95)

Preflop: Hero is BB with :5h, :5d
3 folds, Button calls $1, 1 fold, Hero checks

Flop: ($2.50) :5c, :3h, :9h (2 players)
Hero bets $3, Button calls $3

Turn: ($8.50) :7d (2 players)
Hero bets $8, Button raises $19, Hero calls $11

River: ($46.50) :8s (2 players)
Hero checks, Button bets $10, Hero calls $10

Total pot: $66.50

Villain: 50/16/ 1.5 aggression
oft raise ich preflop. ehrlich gesagt keine ahnung wieso hier nicht.