What do you mean by reaffirm the loan?
Is that mean I'll keep paying it?
Sorry, this is new to me
It means that via the bankruptcy proceeding you agree to basically not include the car in the bankruptcy and to continue on with the current contract that you have. You would only do that if you want to keep the car. Since it might be quite difficult to buy a car after the bankruptcy is final, that is one reason why you might reaffirm the loan.
Others are saying to not reaffirm the loan but keep paying the car payment. In that case, the loan company is unlikely to repo the car because they are still getting paid, and they would much rather get paid than repo the car. If that works it gives you some flexibility because you can keep the car and eventually pay if off, but you could still stop paying for it and let them repo it without being responsible for any shortfall when they sell it.
Yet others are stating to let the car go completely in the bankruptcy, because you probably got a bad credit deal, and to find some other way to get a car. I don't necessarily agree with this one, particularly if its a good car and you would have difficulty obtaining anything reliable.