Most Helpful Girl
You don't call dibs on a girl, they aren't a thing for you to own but a person with feelings just like you and your friend, i think your friend isn't too great for doing that, i think you need to find out who she actually likes too instead of fighting over her, she has expressed interest in you so i think talk to your friend, explain how she has expressed more interest in you and that maybe it's possible she doesn't actually have any interest in him, nether of you for sure know who she's really interested in, so i think to settle things you need to ask her who she is interested in otherwise how will you know which of you she really likes? yes she has expressed interest in you but you never know until you ask.
Most Helpful Guy
How can you call dibs on a girl? It goes by whoever makes the first move win!