it is normal to love a girl at that early age. However, have you considered the reason she wants to leave you now after a year of dating? how was your approach in the relationship? were you always demanding for sex or denying her sex? were you committed to the relationship?
these are some of the questions you should probably ask yourself. if you find answers to this questions, itwill help you win her back if you love as much as you claim. feel free to comment back if you need more assistance