Why my best friend would hide her stories from me and not invite me?

My best friend I used to go out with her and her friend suddenly stopped inviting me and I suspect that her friend talks behind my back but I never did anything to her, (I consider myself very attentive and I always help my best friend). Today I found out that my best friend went out with her friend and she hid her story from me, I really don't know why she did it and I didn't expect it from her because we are very close (or we were). Why do you think she did it, or what advice would you give me to feel better?💔

(sorry if my English is not very good, it's not my main language)

Why my best friend would hide her stories from me and not invite me?
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