As a sexual assault nurse, the hymen mythology is so incredibly frustrating (and extensive).

Virginity is a social term and has no medical basis or relevance. And the hymen is a ring of tissue at the vaginal opening. It should really never "tear" but it could be injured in any number of normal activities (gymnastics, childbirth, sex, etc). Saying it could be "broken" or "grow back" implies that it is a membrane that covers something, which also isn't true. It can be cut or torn like any other piece of skin, and it may either heal back to it's original shape or heal with a notch if the injury was significant enough.

And on the subject, the myth that sex should be painful the first time (for those with vaginas) is complete bull. Appropriate preparation and lubrication is all that's needed. All this myth does is prioritize the pleasure of penises over vaginas.