@Ragman,
I don't know that it's tech as much as tech is enabling this behavior. It's also, these days, that there's a push for everyone to be all or nothing. You are in love in 6th grade, ferchrissakes. In 1972, when I was in 6th grade, it was called
liking someone. It wasn't marriage or forever or commitment or whatever.
I think this generation is also growing up with hesitation as their world has always had HIV in it (although it's not the first group to have this; the latter Gen-Y crowd does as well).
Finally, we also know that the people who come here for advice are self-selecting. At least they see that there's an issue.
I'm with the two fellas.
Go up to her and say hi. If you need a script, here's one.
"Hi, Susie (or whatever her name is). I was wondering, did you get the algebra (or insert some other difficult class you share) homework? I thought it was kind of hard. I hope we don't get any of it this weekend. See ya!"
Spread that out in between her saying hello back and answering you, etc. Respond differently if the mood strikes you and it makes sense in the context of the conversation.
Keep it light. This is a friendly conversation, nothing more. Just, be nice.
That should not scare you.