>< well, that's how love is. Even if you're in love with someone, there are always moments where you might suddenly feel that someone else is more attractive. From what you've told us, it seems to me that:

a) your friend isn't too happy with her bf
b) she's quite attracted to this lecturer

I can't really help with a) since that's her own problem, but if you look at b), I think she could write down how she feels in a letter. She doesn't have to give it to him, but at least writing it down will help her identify how she *really* feels about this guy. We may say we really like someone, but what is it we really like about them?

Last, but not least, I think you should just listen to her when she wants to talk. I don't think she really needs any advice right now =D At times like these, we just want someone who will listen to us, without telling us how stupid we are xD