NL 25 - 88 UTG - confused by "insta-min raise"

[reemas]

Opponent is: 37.5/22.8/1.77 sfter 75 hands

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 6 Players

BB: $28.35
UTG: $22.70
Hero (MP): $15.40
CO: $23.75
BTN: $6.25
SB: $14.75

Pre-Flop: 8[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $1</font>, 3 folds, BB calls $0.75

Flop: ($2.10) J[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">BB bets $1.70</font>, Hero calls $1.70

Turn: ($5.50) A[img]/images/graemlins/diamond.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $3.55</font>, <font color="red">BB raises to $7.10</font>, Hero ??

How to play from here? What range do you put him on?