$100NL JJ vs unknown

Rb

Villain is new to the table and despite intensive datamining, I've no stats on him.
This is the first hand I've played with him, I've been very active, open-raising a lot, this is the first time he has 3-bet me.
He got his 37 BBs from another villain folding to him on the turn on a seemingly dry board.

Full Tilt No-Limit Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($88)
BB ($160.65)
Hero ($115.95)
MP ($137)
CO ($115)
Button ($105.05)

Preflop: Hero is UTG with J, J.
Hero raises to $3.5, MP raises to $12, 4 folds, Hero calls $8.50.

Flop: ($25.50) 2, 6, T(2 players)
Hero checks, MP bets $15, Hero???

Standard situation, but what do we do?

DEmeant0r

Vs unknown, i'd fold this, assuming he's not a donkey, the only hands you're beating that would reraise preflop is AK, AQ.

ianmc38

Sometimes c/c reevaluate turn. Sometimes c/f

Rb

K I called the flop, turn was a blank, I check and he times down, bets $15 again.

I called, checked the blank river and he shoved, anyone calling!??

mrflash

I agree with your call postflop but i fold to any further action on turn or river.

NeoSlicerZ

Depending on my mood I'd either call or fold.
I think once you call the flop, I'd prefer to bet/fold the turn rather than c/c then c/f the river. If he calls the turn, I'd c/f river then.
As played I don't think I find a call, the riveroverbetshove is rarely a bluff..... but you've played your hand very passively at this point.