Why do men get mad at you because you are mad at them?

My "friend" obviously knows he's royally on my f-u list because he's messed up so many times. The last time we got into an argument it was because he said some things about me that I was not suppose to find out about. So he's been calling me but I've been ignoring his calls, because knowing him it's not to apologize. So finally when I speak to him, you would think he would say sorry? Nope..Instead he gives me attitude! Wth does that mean?