Villian has VPIP of 37, PFR% of 2, and total aggression factor of .3 after 50 hands.
I think I played this hand poorly.

Party Poker No-Limit Hold'em, $ BB (10 handed) from (Format: FlopTurnRiver)

saw flop|saw showdown

UTG+2 ($22.75)
MP1 ($48.25)
MP2 ($39)
Hero ($65.70)
CO ($25.95)
Button ($41.27)
SB ($71.10)
BB ($32.75)
UTG ($36)
UTG+1 ($76.74)

Preflop: Hero is MP3 with 5, 5. SB posts a blind of $0.25.
1 fold, UTG+1 calls $0.50, UTG+2 calls $0.50, 1 fold, MP2 raises to $2, Hero calls $2, 4 folds, UTG+1 folds, UTG+2 folds.

Flop: ($5.75) 5, T, 6 (2 players)
MP2 bets $3, Hero calls $3.
I was not sure if I should reraise in this situation. My initial plan was to call the bet representing a flush draw. Then if the turn was not a heart, I thought villian would raise, and I could move in on him. This way villian would be more commited to the pot.

Turn: ($11.75) J (2 players)
MP2 bets $9, Hero calls $9.
Should I have gone all in here?

River: ($29.75) 8 (2 players)
MP2 checks, Hero checks.

Final Pot: $29.75

Results in white below:
MP2 has Ac Ad (one pair, aces).
Hero has 5s 5c (three of a kind, fives).
Outcome: Hero wins $29.75.

Thanks.

This is wrong wrong wrong! RAISE THE FLOP! This is one of those situations where if you had been aggressive on the flop, you opponent would have given you his stack right there. Instead, you got an extra $9 from a pretty bad opponent and got stuck checking it down.

You raise to $11 on the flop, he pushes, you call. That is pretty much how the action should have gone. You can represent you have TPTK and he can push thinking he is way ahead.

50 hands isn't enough for me to have an accurate AF, although it sure tells you that he probably wasn't going to bet the hand for you...Also, he had only raised once in 50 hands which might say he only raises with big overpairs...I would rather trust PFR over a short sample than AF, but that is just me(he did almost pot bet that turn into you which says he does have some aggression).