Who to go to the formal with?

So me and close girl friend are going to a formal. I go to another school so she's invited me to come. Another guy that goes to that school as her. He and I have been texting/face timing and he openly stated that he likes me. He wants me to go with him to the formal but, I want to be the good friend and go with her. I'm very confused on who to go with. The formal is I a month and I already have a dress and everything, now I just need to know who to go with. Any suggestions?
Who to go to the formal with?
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