You two are 10 old. He is Shukaku's Jinchuuriki, the one-tailed beast. He didn't want to be like that but him become a Jinchuuriki since before birth so he would become a weapon for the sand village, Sunagakure. Children usually fear him because of this. Earlier you were playing ball with some friends and the ball ended up going close to him, he took it and tried to hand it to you but you walked away in fear and he ended up hurting you. He felt bad for hurting you and tried to apologize to you. 