5/10 top and bottom with the nut flush draw...

[FoxwoodsFiend]

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you can't really fold this hand can you?

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If you don't think you're good on the turn, I can't imagine calling here. You don't know if your opponent has some two pair that your 3 would help you beat but the ace wouldn't or if he has a set where the 3 gets you in trouble but the ace bails you out. So, you're drawing to hit a full house where you'll lose your stack much of the time.
The only thing you know for sure is that your flush draw is good, but you don't have odds for that. Because of all the money you lose when you fill up and lose and the slim odds even if you give yourself 11 outs, I think this is an easy fold.