Misunderstanding between me and my teacher.plz help.?

Me and my teacher always play the game of chess most of the times he wins.Today after defeating from him I told him that I'd only won 10 times outta 100.But now he is saying that(oh!a phone call of mom .....he told me not to angry with him) I told him 20.Then we began to quarrel with ourselves.I lost my temper and shouted at him.