Crush flirts with other guys, what to do?

Anonymous
So my crush who I have reason to believe is interested in me, flirts with me, but with other guys as well.
Just today she was walking with me and saw her guy friend (fuck this guy) in front of us and she ran to him kinda touched his elbow. They went up to her locker, I usually go too but felt like shit so I just went home.
What can I do to make her only flirt with me not him!
Crush flirts with other guys, what to do?
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