atiels biting?

me and my bf went and broght a year old atiel. after abut a week he was flying arund the room. now he will come and sit with us n are bed and will play with every thing. he hates being away. he has made a habit of biting me and my partner. im not shore if he is playing or not. he will bite are fingers if we move to fast toword him. does any one now how to stop him biting us its not agrsivl biting