I know there's 3rd person etc... but can a story be told from a secondary character's POV? or does that never happen and would be useless? I want the story from the girl's view, but i really want the story to revolve around the guy.
Yes, the narrator can be a secondary character.
The beautiful Song of Achilles by Madeline Miller is about the warrior Achilles and his life, but told by his lover Patroclus.
The Great Gatsby is told by Nick Carraway, almost a tertiary character in the love story between Gatsby and Daisy.
All the Sherlock Holmes stories are about Holmes, but almost all are narrated by Dr. Watson.
(Although if I might interject... why, why, why are you having a woman as the narrator if the story "revolves around the guy"? Why can't the woman narrate her own story? Why isn't her story interesting enough to tell?)