You and her are just oil and water at this point it seems .. Sad of course.

Th reality of it is you are really never going to know what happened and why.. Thats just a dead end road and no reason to even bother going there. Not worth banging your head against the wall over.

Friendships end for all kinds of reasons. Look to the future and find like minded people that will enjoy your company and it be a mutual healthy friendship.

Best of luck !