What will you do if you meet with this embarrassing situation.Help~~~~~

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My parents have been divorced for over one years. Even though they have many problems in the past unhappy marriage,they still have a will to stay together in the rest life after thinking about life seriously. Of course,I know they have choosen new partner who did't live up to their satisfaction.But today when I visit my father without advanced accounts.To my surprise,I meet that woman my father tells me many time by accident. I konw I shouldn't be unhappy. But I am still angry though I control my temper.What would you do if you were me? Please give me some advice.