Pushed out of a trio

So I (let’s call me OP) joined a friend group about a year ago. There were already 3 of them — Friend 1, Friend 2, and Friend 3. I became closest with Friend 1, we talked every single day for hours on Viber. Then about 3 weeks ago everything changed overnight. Friend 1 stopped talking to me daily and now only really talks to Friend 2. They got back into a game together that the original three used to play, which rekindled their old dynamic from before I joined. Friend 3 and I are still good. I tried to join their inner group and got flatly denied. Friend 1 still calls me sometimes but I’m clearly the afterthought now. I don’t have any other friends outside this group. Friday is the last day of school and I’m planning to confront Friend 1 then. Not sure if I should bother or just quietly drop him. What would you do?