Prom Situation

Ok, so I asked my bff to prom (who goes to a different school). But, I also have a crush on a guy and he is starting to show interest and talking about prom whenever I am around (he is a sophomore I am a junior). I would like to ask him to prom to get things started between us. I don’t want to ditch my bff though and one of my other friends is willing to take her. Is it ok to ask the guy? Should I just go with my Bff? Help please. Thanks 🙂