Does Ukranian woman talk to other guys even if she has a boyfriend?

I was talking with a girl since a long time. Learned almost everything about her, her family etc. But she didn't tell me that she has a boyfriend for a very long time. And she probably knew I liked her. I'm asking is it normal for their culture? Even though they have boyfriends? I would't want that if I was that guy.
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Does Ukranian woman talk to other guys even if she has a boyfriend?
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