how to defend my middle pair?

Posted 9 years, 5 months ago

Blinds: $0.02/$0.05 (6 Players) MP: $5.00
CO: $7.00
BN: $18.67
SB: $5.40
BB: $5.60 (Hero)
UTG: $5.82

Preflop ($0.07) Hero is BB with 8 8

2 folds, CO raises to $0.15, 2 folds, Hero calls $0.10

Flop ($0.32) 5 2 4

Hero checks, CO checks

Turn ($0.32) 5 2 4 A

Hero checks, CO bets $0.20, Hero calls $0.20

River ($0.72) 5 2 4 A J

Hero checks, CO checks

Final Pot CO wins and shows two pair, Aces and Fives.
BB lost and shows a pair of Eights.
CO wins $0.69
Rake is $0.03

not sure what to do on flop, and I think I should 3-bet pre flop.