You couldn't stand the thought of her being around anyone else, and before you knew it you acted without thinking. Deep down you know things will never be the same after this, but at the very least you can make sure she's comfortable...for however long
The police didn't listen to your story about your bullies stealing your things and forcing you to walk home like this. They were after the escaped asylum patient with greeny/brown hair who liked to make up stories and protest her innocence...