I’m [15] tryna get with my female friend [15] but idk what to do.

So l'm tryna get with my female friend. Out of our friend group I'm referred to as the wild one. I call her bout every day and we'll talk for bout 30mins to an hour. Our friends will always say to us that I'm interested in her but I'll just play it off and she'll just completely deny it. Shes told me before that she thinks i know how to talk to girls, and that i have game. Recently she said that if i had a glow up i could start to get more girls. I wouldn't consider myself attractive. The thing that really makes me think this isn't possible is that she used to in a relationship with my good friend, but he cheated on her. Recently she told me that she wants to get back together with him. I don't know what to do.