Why doesn’t my ex want to be friends?

I broke up with my ex due to incompatibility, but I still think that she is cool people and we have the same friends.

Every time I text her, she leaves me on read. Every time I try to talk to her when I see her, she is polite and courteous, but it’s not how it used to be. She also unfollowed me and removed me as a follower (and when I tried to follow her again, she didn’t accept my request).
Why doesn’t my ex want to be friends?
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