[GaZaZaZa]

def looks like a fold.. the most likly hands your up against hear is a better low AND...

low plus .. you are 37% equity
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
4s 3s 4d 3d 88 467 297 56 111 703 6 0.371
As 2s 4c 2c 274 297 467 56 703 111 6 0.629

low plus two pair you are about 45% equity
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
4s 3s 4d 3d 96 603 153 64 111 703 6 0.457
As 6c 3c 5h 138 153 603 64 703 111 6 0.543

you dont even wanna know what you are if he already has the straight!!

and your real best case senario here is you being slightly above even

4s 3s 4d 3d 102 737 21 62 111 703 6 0.538
As 6c 3c Kh 12 21 737 62 703 111 6 0.462


SO yes.. fold pre-flop.. and given the way you played it, check behind the flop waiting for a big card on turn, and yes fold to the re-raise,,, your either quite behind, or just marginally ahead, not the best spot to be putting in 150BB with!!!