How can i get this girl to looka t me as more than a friend?

She had a breakup with her boyfriend and she is still infatuated with him and its already been 1 month. She still "loves" him mind you we're in high school. i have been comforting her and even flirting with her a lot. YEt, she goes back to him and doesnt look at me as more than a friend And he is a giant to her anyway