Advice please

My “best friend” and i haven’t talked in over a year. And I honestly feel like I have lost her as a best friend. Idk what to do, I want to block her and unfriendly her, since her and I don’t talk anymore and she only hangs out with my other two best friends, and talks to them. I have messaged her but she never replies to me but she replies to my other two best friends and visits them. And I just feel hurt that after so many years of friendship, it’s all gone in an instant. Should I just block/unfriend her from social media, or should I try to talk with her? Because honestly, I don’t know how to feel about this.