How do you make a girl fall in love with you who is taken by another guy?

I have known this girl i nmy school. We became friends and i started falling in love with her and at the same time she found another guy in my class who she fall in love with. I still think i deserve her more than he does becuse all he does with his life is to steal from stores, painting graffiti on walls and geting angry all the time. I don´t think she should be with such a guy becsue i fear that he may threaten her force her to stay in the relationship. I just need to know if there is anything that i can do to make her feelings change.
How do you make a girl fall in love with you who is taken by another guy?
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