In my thought view, you and your friend can be friends for a very long time, but you can risk that by confronting her. As for your crush, 99.9% of relationships in highschool never really last anyway. So if you do confront your friend, you risk losing her but your chances of a temporary highschool relationship slightly increase, and if you don't you and your friend will stay friends and you can eventually get over your crush. This is just my opinion with the information you gave.