Does the girl pay for dinner if she asks a guy to prom?

Do you WANT to pay for dinner is the question. First off, did you ask him as a friend or is there something more?

If it's just friends, then I'd talking to him about going dutch, in other Words, paying for your own meals. If it's more than friends, then it's up to you but this I can tell you for sure

FIGURE IT OUT BEFORE YOU GO OUT TO DINNER! otherwise it could be a potentially awkward situation for the both of you and put a bit of a damper on the night.

Best of Luck!