(25NL) BB special flops 2-pair. Fold to 4-bet shove?

[JoshNjuice]

No reads.

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($25.25)
Hero ($23.65)
UTG ($24.95)
MP ($20)
Button ($21)

Preflop: Hero is BB with 4[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img]. MP posts a blind of $0.25.
UTG calls $0.25, MP (poster) checks, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: ($1) 4[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets $1</font>, <font color="#CC3333">UTG raises to $2.5</font>, MP folds, SB folds, <font color="#CC3333">Hero raises to $7</font>, <font color="#CC3333">UTG raises to $23.75</font>, Hero ???

Is this a loose 3-bet here? I figured he might be raising with a weak flush draw, or maybe one pair, and I wanted to find out where I was in the hand. His 3-bet shove made me nervous as it feels like 98, 99, 88, 44.

JoshNjuice