How to get over a girl that doesn’t like you

I really like this girl but she prioritises other people over me and hang out with especially this one girl. I try not to get jealous because it’s her life and she can do whatever she wants but it’s hard. Whenever I see she post that she hang out with her I feel it in my heart and my whole day is destroyed. I just wish I was her and it hurts a lot that I can’t be the girl she loves. How to deal with these feeling?