Even if you're upset, it's better to hold your temper back a bit. You want the other person to hear you. He or she is more likely to listen to you when you're not so angry. Being hostile makes it hard for other people to listen to what you have to say. Think of when a microphone or a radio has static-it interferes with the words and sounds. Intense emotions that are accusatory and angry are like static that keeps you from being heard.
This means definitely telling the other person what's bothering you and what hurt your feelings. When you state your case, you should tell him or her how you see it. However, don't make accusations and try not to be angry.