B I didn't find the plot difficult to follow but did wonder about the maturity of the girls involved, I can't work out if they were exceptionally naive or the 'boy' was exceptionally intelligent, I'm currently going on the former.
I do think it's a bit harsh regarding the comments about her first love though. As she says, she knows that the fella didn't actually exist but all the feelings she had were real enough to her, as well as the memories she has of them as couple. I liken it to a couple who have divorced, you may come to hate the person or believe they're not the same person you fell in love with, but you can't undo the memories of the feelings you once had for that person. I think it's actually quite simple to understand in that respect.