can cops press charges on a juvenile if the victim says they do not want to?

ok so lets say bob is a juvenile and gets mad about something and starts cussing and slamming things

then his Cousin a girl comes in the room he is in and he pushes her out then punches the wall and cusses some more, then she calls the cops they come and she says he need's to calm down and go some where to talk to someone about his anger,next they ask her if she wants to press charges and she say no,so he gets bakeracted and goes to a place for 3 days, he does not go to the Juvenile Detention Center,he goes to this other place were you go to get help,then 3 days later he goes back home and everything's fine and well then one week later him and his cousin get a court summons and on mine it says i did battery or something like that, what i want to know is why do i have to go to court if she pressed no charges im like wtf because we get along well it just happen'd because i did not take my medicine and i was already mad that day and she just pushed the wrong buttons so i went off on her and she only told the cop i pushed her , and the cop even told me if i had charges i would be going to jail but i did not and she said she did not want me to go to jail or a group home i heard her tell the cops and she told me she did not file charges so why do i have to go to court ?