Why does my friend act like we’re close but at the same time acts like she doesn’t care about me but cares about all of her other friends?

so basically me and this girl got really close over the course of a year, but she acts super nice to me one day and then cold and semi ignores me the next day. I don’t know why I did and I’ve told her how I felt about this multiple times yet she doesn’t seem to care, she acts like she cares when she continues to do it, she will care at all of her other friends and seems to really like them and treat them well but when it comes to me, she seems to not care about me at all or my feelings

Why does my friend act like we’re close but at the same time acts like she doesn’t care about me but cares about all of her other friends?
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