Why is my best friend igoring me when I started dating?

I love her and I never ignored her nor did I change, we still organized girls nights out and so on. well now I just backed off, after continuously asking her what is going on and getting no answer. Why would she be like this? Just cuz she sees me happy with a Man that actually treats me right? I am sad because I care about her but at the same time i'm fed up I have other things to worry about.

Why is my best friend igoring me when I started dating?
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