JJ vs Unknown

Didn't realise I had 35 hands on this guy... But still it's a small sample. What's the play?

$0.1/$0.25 No Limit Holdem
6 players
Converted at weaktight.com

Profiles and Stacks:
UTG ($18.25) 33.3/6.7/2.3 (135)
UTG+1 ($13.00) 54.5/3.0/1.8 (33)
Hero ($27.90) 11.1/10.4/2.3 (135)
BTN ($25.75) 17.1/11.4/6.0 (35)
SB ($17.15) 50.0/4.2/0.4 (24)
BB ($26.00) 13.2/11.8/10.0 (68)

Pre-flop: ($0.35, 6 players) Hero is CO
1 fold, UTG+1 calls $0.25, Hero raises to $1.2, BTN calls $1.2, SB calls $1.1, 1 fold, UTG+1 calls $0.95

Flop: ($5.05, 4 players)
SB checks, UTG+1 checks, Hero bets $3.6, BTN raises to $7.75, SB folds, UTG+1 folds, $4.15 to Hero ($23.1)?

ummm, u can reraise to commit if you think he does this w/ weaker made hands like 55-TT, and if he gets it in w/ FD. if u think a bluff is a bigger part of his range, better to just flat and let him continue to bluff. understand u r flatting w/ the intention of never folding since u have to assume u have the best hand here. plus the fact that u have the Jc gives u added equity.

I probably get it in here, I can't see him flatting worse and with how aggro he is postflop he could very easily be raising a draw or like marshall said a weak made hand.