50 NL - Am i being played back at? When to fold, when to call down?

[Chip Monk]

Villians stats are 38/2/.5 across 50 hands, his flop agf is 2.

I had raised the last 3 hands in a row (with premium hands), so may have looked agressive, which influenced me to think i was perhaps being played back at.

Party Poker No-Limit Hold'em, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Hero ($52.03)
UTG ($51.72)
Button ($92.74)
SB ($61.79)

Preflop: Hero is BB with , .
[color=#666666]1 fold</font>, Button calls $0.50, [color=#CC3333]SB raises to $2.5</font>, [color=#CC3333]Hero raises to $6.75</font>, Button calls $6.50, SB folds.

Flop: ($16.50) , , [color=#0000FF](2 players)</font>
[color=#CC3333]Hero bets $9</font>, [color=#CC3333]Button raises to $18</font>.

Final Pot: $34.50

How do we decide if we are just being played back at with limited reads? Fold and wait for more info? Or call and Re-evaluate turn? Thoughts appreciated.