The virus can be expelled by your body, eventually.
Guys can't really be tested for HPV, because the virus is active only in women usually. So a guy who tests negative can have HPV. So can a woman who tests negative, because it could just be dormant.
As far as if yours is gone for good or just suppressed, I haven't found any information about how you can tell, but if you were positive for HPV and now you're negative it is possible you already got rid of it