She's being overly secretive over a simple crush, you have decided.
While she keeps avioiding you, you discover her Chemistry notebook disappears along with her during one of the lunch breaks. Even though you decide not to confront her about it, you end up invading her privacy again when the following break comes, a couple of hours later.
You see a new letter has been written.
Tuesday, August 23
I've given into writing yet another letter. I have tried to not do this, to not think about you or wonder what it would feel like to have your skin pressed to mine, to look deep into your eyes, to be pinned up against a wall with your large frame hovering in front of me, your arms almost touching my face, your lips pink and plump, crashing on mine, your hands holding my hips, caressing my cheeks... Yeah. I've been trying to avoid doing that. But I thought... If I repress it all like that it might blow up eventually. On the contrary, I vent it out... I don't know. I may run out of feelings. I know, i know. It is a sad thing to say, but it's just... I need to come to terms with the fact that you and I will never be together and that should be enough to make these feelings go away, but you know, as they say. 'You can't rule your heart' (That's a thing my mom always tells me. I think it's mexican? 'En el corazon no se manda'). I just hope this will go away because it's painful seeing you every single day and knowing that you'll never be mine, and I'll never be yours.
Sincerely,
Me.
You find yourself shedding a few tears, that you wipe off immediately as you close the notebook, hoping that you didn't stain the pages. You put it back and go sit in your place. 'that was beautiful, Xav, but it pains me to know that you're suffering like this for someone who's probably not even worth your love' you think as you bury your face in your arms over your table and pretend to be asleep, just in case she comes back before the bell rings. You didn't sleep much last night anyway, and so you really fall asleep, thinking about the letters and wondering who this person is, and how much you want to punch them for making your best friend suffer.