My boyfriend is private messaging another girl on facebook. should I be concerned?

Anonymous
hi helpful people,

I'm a girl and I have a boyfriend - we've been dating for a year and a half. I'm concerned about something - maybe trivial, maybe serious. while he was checking his email in front of me, I glanced over briefly and noticed that he's been private messaging another girl on facebook... this struck me as odd because he's not the type of guy to make friends with women at all - he's said so himself and has no long term friends that are women.

about this girl: he was studying abroad for a few weeks and met her. he's since returned to the west coast/doesn't see her anymore.

i had the opportunity to go on his computer and find out what he was saying to this girl, who just so happens to be very attractive, but I didn't. I'm wondering if this is something I can ask him about without appearing jealous or creepy? or should I just let it slide and do nothing. the only reason I'm concerned is because he doesn't have any friends that are girls and they're privately messaging each other/not writing on eachother's walls. weird, huh?

so if you're a guy, tell me what reason you'd have for private messaging a girl you randomly met and if it's worth me making a big deal over.

please help!
My boyfriend is private messaging another girl on facebook. should I be concerned?
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