If a guy you're dating flirts with other girls and isn't that dedicated (yet) is it a bad sign?

Anonymous

Is it true that guys can grow to like a girl more and become more dedicated to her, or is it true that if they aren't dedicated in the beginning, they just aren't into her like that?

I'm asking because the guy I'm dating (3 months now) and we're exclusive, is apparently flirting with other girls and said to his friends that he's "open to meet girls" behind my back. But his best friend says he's really into me and it doesn't have to be that dedicated at the beginning. Which is right?

If a guy you're dating flirts with other girls and isn't that dedicated (yet) is it a bad sign?
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