Is having a female best friend a turn off?
What Girls Said 2
Not for me.
What Guys Said 2
A lot of girls would see her as a rival, especially since she is close to you, has known you longer and knows things about that the girl you just met doesn't.
That said, a confident Girl would be able to tell that there is Nothing going on and wouldn't let it bother her. If there are Feelings, she might pick up on it and that would usually be a dealbreaker.
If she has feelings for you then yeah it probably is, sorry dude :(
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