Hi and welcome to TeenHelp. I think that you shouldn't tell your mom as that could end badly for you. You have done nothing wrong, it wasn't your fault that your best friend did that to you. Now you have moved on from that school so that you don't think about it. You will make new friends that will trust you because your old friend is not a friend.
I will sent you a friend request and if you ever need to speak to me about anything you just need to ask.
Take care and remember you have done nothing wrong
