So I'm dating this chick and we're really cool. She

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So I'm dating this chick and we're really cool. She has this best friend she's really close to her, like sisters close. I suppose I'm sort of friends with her at this point as well, but nowhere near as close. Anyway, we're pretty young although I'm older than them by a couple years and her friend is "talking" (I hate this term) with a new guy after breaking up with her last boyfriend. Since she's so young, she really hasn't had the opportunity to date a whole lot of guys and thus doesn't know red flags when she sees them. First one that caught me is that these two haven't even gone on a single date yet and within the week the guy is ogling her and telling her that he loves her. Second red flag is that he lied about being a virgin and to lie about something like that so early on...

The way I see it, it can go two ways: A. he's clingy as fuck, or B. he just wants to get in her pants (which is probably the case). Now, she's still my friend, and my girlfriend's best friend and I really don't want her to get hurt, but is it any of my business to say anything or should she just learn?

I asked a coworker about this and she said that I should ask my girlfriend how she feels about the guy and then express how I feel, and another friend said I should just let her coalburn and learn. I'm pretty torn. What do you guys think?