I feel jealous of one of my friends hanging out with another of my friends and I don't know what to do

So last week, November 4th, I had a crush on one of my friends in my class, I'll call her A. A was just a crush that I just wanted to stay as friends with. So, the week after, my friend A was hanging out with another friend in my class, I'll call her F. So, A and F would hang out more often and I would feel upset because I wish I could hang out with A again. I've also been feeling a bit distant from A, and I don't know if I should tell her or F. If anyone sees this, could you please give me advice on what to do?