Folding a boat. 100nl

[FearNoArt]

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

MP2 ($92.55)
MP3 ($112)
CO ($99.50)
Button ($98.50)
SB ($98)
Hero ($100)
UTG ($63.80)
UTG+1 ($75.25)
MP1 ($70.25)

Preflop: Hero is BB with 3[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls $1, MP3 calls $1, <font color="#666666">2 folds</font>, SB completes, Hero checks.

Flop: ($4) 2[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets $3</font>, <font color="#CC3333">Hero raises to $10</font>, MP2 folds, MP3 calls $10, SB folds.

Turn: ($27) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, <font color="#CC3333">MP3 raises to $58</font>, Hero folds.

Final Pot: $100
<font color="#009B00">Main Pot: $57, won by MP3.</font>
<font color="#009B00">Pot 2: $43, returned to MP3.</font>

Results
No showdown. MP3 wins $100.

Villain is 100 NL regular and runs at 19/2/.60 and pretty much plays ABC poker, I run at about 13/6/1.7 I cannot see villain making this play 88,99,TT, he also bets any big hands PF, so it's unlikely he has big overpair. My flop raise should Indicate I have at least 2 pair if not set, and yet villain cold calls my flop raise with SB still to act, then raises my turn bet.Only hand I can think villain playing this way is 77 and slimmer chance of 22. I know you should almost never fold a boat, but what am I facing here that I can beat, is this a terrible fold ?