Do women make up fake boyfriends if they like a guy?

Do they pretend to have a boyfriend if they are flirting with another guy? Have you done that? To make the long story short, people told me this woman likes me. Maybe she flirts but in conversation, she has mentioned she has a boyfriend. I do not want to go out with her. She is much too young for me and not my type. I believe she has a boyfriend anyway.
Do women make up fake boyfriends if they like a guy?
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