I want to throw a coffee cup at him
Can you tell me why you feel this way?
I just want to forget all about him!
I get that you are angry, but you should not throw things at people. You should just leave the situation if you are that angry with him.
I know but I'm really angry at him and I want to see his reaction when the cup hits him.
No matter how angry you are, I have to insist that you do not resort to throwing objects or attempting to physically harm someone else in any way.  A ceramic coffee cup, when thrown through the air, could be a potentially lethal object, and you would not want to have to deal with the consequences of such an incident.  Wait until tomorrow, and then let him know how angry he made you.