Need some advice...about prom.

[BP-Revo]

Long story short I asked someone to prom, and they didn't give me an answer yet. I asked my bro about it and he said that she's waiting for someone else, and right now, its the only logical explanation. The weird thing is that we've gone out a couple times, and it was always positive signs and reactions.

My bro says I should retract my offer and not go with her even if she says yes, since I would then be second choice at that point. And who wants to be second choice?

What do you guys think? I think some outside opinions would be quite helpful at this point.

Its my senior prom so I really don't have a "next will be better" option.