Is AUTHOR wrong in the post ? POST : For context she's 24, I'm 26 and we've been dating for 3 years. About 2 weeks ago this guy (let's call him A) she used to be friends with in middle school hit her up on facebook saying he's going to be in our city for a week and would love to meet and catch up and everything. They were good friends till sometime in high school when he moved away and they gradually fell out of touch. Which is totally fine, nothing wrong with that. 

They were originally planning to meet alone till he found out she has a boyfriend and insisted she bring me along saying he wants to meet me too. Anyways we meet and wtf, this guy is incredibly good looking. Like tall, strong jawline, body of one of those guys from fitness magazines kind of good looking. A bit surprising (mainly cus of what she'd told me about him - when they knew each other he was a fat, awkward kid with a funny accent), but again totally fine. Very nice guy, very respectful (not making moves or anything), but I don't know if I could say the same for the gf. Like I said we've been dating for some time so I know her pretty well, and she *very clearly* had the hots for this guy, she'd practically have a "f\*\*\* me" face on every time he'd say something to her. Honestly that part kind of hurt because while I know she's attracted to me and our sex life is good, I've never seen her look at me with that kind of lust... To make things worse since that first day we hung out with him she keeps talking about him, I haven't said anything about it cus I know she'll just play it off saying I'm overreacting but yeah, not great. 

He's leaving in a few days so this won't be a problem anymore, but she's said she wants to hang out with him again before he goes... and this time without me. Her justification for it seems to be that I'll get bored + she felt they couldn't catch up very well last time because he was being polite and trying to include me in the conversations so they couldn't really progress past small talk. But just the thought of her going out with him alone, knowing her attraction for him just doesnt sit right with me

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Am I overreacting here? Or is this legitimate reason to worry?