BB has been limping in a bunch of pots, haven't seen him raise preflop after about 50 hands. postflop, i haven't seen him do anything out of line. should i bet out this flop? and the way i played it, should i be calling this river?

PokerStars No-Limit Hold'em, $0.50 BB (9 handed)

MP1 ($56.05)
MP2 ($39.25)
MP3 ($18.75)
CO ($11.95)
Button ($12.60)
Hero ($66.70)
BB ($18.35)
UTG ($39.20)
UTG+1 ($19.25)

Preflop: Hero is SB with , .
UTG calls $0.50, 6 folds, Hero completes, BB checks.

Flop: ($1.50) , , (3 players)
Hero checks, BB checks, UTG checks.

Turn: ($1.50) (3 players)
Hero bets $1, BB raises to $3, UTG folds, Hero calls $2.

River: ($7.50) (2 players)
Hero bets $3, BB raises to $14.85, Hero folds.

Final Pot: $25.35