Thiss just started bugging me..?

okaay so last year i was talking to my friend. and my other friend reaches into my bag and takes my ipod and looks at my musicc. and the teacher walked right by and takes it away. then later towards the end of the day she asks me if i took thhe ipod off her desk cause its not there. and shes like asking everyone if they tookj the ipod. now im wondering who should've been responsible for the ipod. and the other day i was talking to my friend nick and we were laughing about this and hes like oh yeah it got lost right into her purse. lmao. so i dont know. who should be responsible for the ipod getting "stolen" ?