Why do most girls think I'm going to flirt with them if we happen to pass by each other or just be in the same presence?

I've noticed that when I'm around or happen to be in the same vicinity as many different girls

They tend to pre assume that I'm going to flirt with them just for passing them by or being in the same vicinity

I don't view myself as attractive in the least but also neither too unattractive

Why do most girls think I'm going to flirt with them if we happen to pass by each other or just be in the same presence?
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