NL25 is this river a fold?

[QuietEarner]

Villain is 34/21/1.2 over 50 hands. Haven't seen him do anything strange yet other than play to many hands.

Full Tilt No-Limit Hold'em, $0.25 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

CO ($26.20)
Hero ($35.40)
SB ($25.85)
BB ($29.20)
UTG ($41.60)
MP ($28.80)

Preflop: Hero is Button with , .
[color=#666666]3 folds</font>, [color=#CC3333]Hero raises to $0.85</font>, SB calls $0.75, [color=#666666]1 fold</font>.

Flop: ($1.95) , , [color=#0000FF](2 players)</font>
SB checks, [color=#CC3333]Hero bets $1.3</font>, SB calls $1.30.

Turn: ($4.55) [color=#0000FF](2 players)</font>
SB checks, Hero checks.

River: ($4.55) [color=#0000FF](2 players)</font>
SB checks, [color=#CC3333]Hero bets $2.7</font>, [color=#CC3333]SB raises to $9</font>, Hero calls $6.30.

Final Pot: $22.55

Should I fold to river raise. My initial bet was for value, so should I assume a raise means I'm beat.

[ICMoney]

It's unlikely the jack helped him.

The board was not very scary so he might not have felt a need to protect a flopped set/2 pair, etc.

I'm usually shown the goods when people CR the river.