Why do women’s reaction change when they a notice a woman talking to a guy?

So I was at the doctors today and this girl I knew from back in high school approached me. She was there with her kid. As I was talking to her catching up, I noticed the other women in the room were looking over at me and really smiling. It was like a light switch turned on. Before this girl approached me I was like a ghost in the waiting room. Why the change in reaction?

Why do women’s reaction change when they a notice a woman talking to a guy?
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