with whom u recently got angry with?

i got angry with my friend because he came late to the meeting spot which made us cancel the movie trip

With my classmate. He's a groupmate in my thesis and he's in charge of the designing of our system. I've done almost all the requirements in documentation and we have the system running but he seemes like doing nothing for the design. I was really mad because he kept on demanding the documentation but the design is not changing. Well that was for a while, I didn't confront him or whatever. I cried actually. hehehe.. I'm the person who doesn't get mad easily. I don't burst out right away. I control my emotions. My classmate issue happened few months ago, guess months ago. So it was that long already. Well, I dont like getting mad. I prefer to have a boring emotion than being mad to something or someone.