betrayal by a friend :(

i have a friend, she betrayed me I was very sad but I can not get mad at him, he’s a good kid but I am puzzled why he betrayed me and one of my friends, I am sad, I’m not sure gimana, and my friend had a two new friends, I hope they’re better than me, but you should not forget about me, I do not know what to do, if you do not have friends in because the betrayed betrayed by a friend of his taste really hurt:(