Did the friendship involve you helping her with her classwork? If so you have a likely explanation for why the relationship ended with the class
Of course it involved helping her--she was failing the class, because she was missing half of the days there-- So, after the "friendship" began, I helped her to catch up on things, and ,of course, she passed the class.
That would not had bothered me all that much, if not for the way she responded to me trying to find out why she was ignoring me for, and her subsequent response.
Afterwards, I felt unsafe allowing any girls at college to make much of a friendship, as I had already been labelled a "problem student", and just wanted to finish the course, wihtout any more problems.
I still feel uneasy today, about approaching a woman. If it is another bad experience, where I get threatened again, for doing NOTHING........I just don't want to be hurt anymore.