There is nothing you need to do to talk to him just keep quiet and see if he will keep his promise and it should go without saying, if he has the mind and considers you as his friend he will give what has been promised before. Indeed sometimes victory can make someone forget and they act greedy to enjoy their own victory without thinking about his words clearly he cannot be trusted in anything as a friend you just act know enough and do not have to deal with a friend who has such a nature.