Girls, Why does my best friend always tell me we’re just friends when we hang out? Am I doing something?

So I don't know if I’m unknowingly doing something but when ever me and my friend go hang out she always says we’re just friends at the end of the day. I haven’t done anything like making a move or asking her out. but we just hangout and be our ordinary selves and she only recently started to do it and it is a little bit weird bc it’s making me feel and question if I’m actually doing something. Any opinions why she would start doing this? Should I be a little distant? I don’t want her to be uncomfortable with me if I am doing something and I don’t know it, or is this like a phase. Any help is greatly appreciated

Girls, Why does my best friend always tell me we’re just friends when we hang out? Am I doing something?
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