What do I do...

I used to like this guy back in 9th grade (I'm a junior now & so is he). We had the same class but we never really talked since there really wasn't anything to talk about. Recently I joined a program that works with the band (he's in band, I didn't know). Coincidentally, during a choreography we're all doing, im right in front of him. He recognized me & called me by my name. I confirmed it. Then when they were going to start playing, i turned & said "don't make me go deaf" & he just laughed. After we came back to set 1, he said "so we meet again" & I just smiled. Every day he'll tell me hey (because manners I'm guessing). Well turns out, another girl in our group who will be a senior likes him too. She doesnt know I used to like him or that I do because i just met her when I joined & I recently found out about this. I'm torn. She's very nice & has always been helpful to me when learning what I have to do & we've bonded a little. Our friendship is just starting to bloom. Turns out the whole program knows she likes him & so does he. I don't want to be in between. Nor do I want her & probably the program to dislike me or think I'm trying to steal her crush. Yesterday I asked him to hold my phone in his pocket during choreography & one of the girls from the program kept looking at me & probably told her something during our water break. However, the girl, like I said, she's very nice & didn't mean mug or anything. We continued talking like normal because I guess it wasnt a big deal but what if later on it does?