If you're thirteen あなた have no say in whether または not your parents want to move...if あなた really want to keep your girlfriend make it long distance, if not break it off.
this sounds a lot like the situation i was in. my dad was making us 移動する across the country and my girlfriend begged me to stay. i tried convincing him to stay but it was no use. we kept a 6 月 long-distance relationship, but then she broke up with me because it was getting too complicatd. i came back to visit, but when i left she broke up with me again. if あなた really 愛 her, keep a long distance relationship. until あなた can 移動する back and see her again.