<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'm in grad school, and befriended a couple of my classmates. One friend, Greg, casually introduced me to his girlfriend, Lia, when our friend group was at a restaurant near our campus.

I noticed Lia started showing up after one of my evening classes. I figured she was passing by after finishing one of her classes.

Then a few days ago, as I'm eating lunch with three friends, I noticed Lia sitting on a bench, reading the paper, but she was wearing sunglasses, and she'd peek over them occasionally to look our way. So I tell my friends and they all try to discreetly look her way and wonder if they should ask her over or...something?

Then one of them mentioned Lia was always around after her 3pm class finished. And then another friend mentioned Lia keeps popping up after their morning classes. Then another friend revealed Lia isn't even a student, she's Greg's high school sweetheart and moved with Greg after he entered grad school and Lia is doing part-time work on the other side of town, so her being on campus after all our classes finished is really odd. Umm...
<bot>: One of our friends has a girlfriend who seems to be stalking a number of us. We don't want to start any false accusations, but this is out of left field for everyone. Advice?