what does a guy do if a girl quits e-mailing

If a girl you know is interested in you and she quits e-mailing you, what do you do about it?

Good question...
Hopefully he'll freak out and want to be with you. Is that what you want to happen?

If I was interested in the girl I'd e-mail her and find out what's going on.

If I wasn't into her, I'd be relieved.

I agree with Name. Email her and ask her. Maybe call her instead. Personal voice communication is better than email ;)

How long has it been since she last email you?