I really enjoyed this.  In spite of being a middle aged man, I related to the melancholic nostalgia.  And, maybe even a little to the angsty ambivalence.    As it happens, a few months ago when I was going through a period of depression, I visited my alma mater, and wandered around being flooded with memories that made me feel melancholy.  It was between terms, so there was no one around.  So, your story stuck a chord with me.