>>16247592She probably is in relationship with him for a long time, but was hoping to find somebody different without breaking up with him first. Maybe she had a change of heart or found somebody even better than you and is about to cheat or dump the school boy.
That or you are projecting onto her random classmate that you know nothing about, moreover stalked them (and later him in particular) like an actual schizo humanity lacking shape of a man.
Get a grip.
