what is his/her problem ?

it's about my ex-friend. since i was in form 1 , we're friends. but now, everything changed. she/he don't want to talk to me anymore. what have i done? that's the question. no one will answer me except her/him. right? but how can i ask her/him? i don't care if she/he wants to hate me but at least, let me know the reasons why she/he hates me. there might be something .

i felt so humiliated when she/he throws my book to my friend in front of me.oh my god , it hurts me a lot. what's the problem? i know that she/he don't want to give it to me but why not she/he just put my book at somewhere else and let me take it by myself.

Ya Allah, give me the strength to go through all this pain ...
Ya Allah, give me the strength to fight those unpleasant feelings ...
Ya Allah, give me patience.