Teenage girls, should i break up with her for her?

ok for a year this girl and i named courtney have been madly in love, we met and the next day she moved out to hurst. we hav ebeen in love online for a year now and neither of us ave moved on yet, and everyday we tell each other how in love we are, but she is 14 and im 15 so we can not see each other and i dont want her to wind up holding herself back in hopes that she and i will be together cuz im a realist and i have come to terms that although i have nvr felt like this for anyone else, we cant be together. i love her enuff to break up with her, should i? i think it will be the best thing for her to move on. but t hurts me too cuz god do i love her