Stress?

As the day gets nearer and nearer, the tension becomes greater and greater and expectations start to grow.

You will start telling yourself "He just got to change. He just got to grow up. Is a new phase of life that he will be going through and he cannot remain status quo forever." Being status quo starts to irk you and getting him to get out from his status quo starts to make him peeve. "I have been like this all along, what is wrong with that?" he will say. But you will rebut "Is a new phase of life of new responsibilities, of new members into it. Being status quo is not going to lead you anywhere."

Somehow, you will flare up with him for no reason. It could be similiar issues from the past which you used to be able to tolerate, but not now. Things start to become less tolerable.

You don't feel the stress coming in but actually the stress is there...unconsciously, which is shown through the behaviour and short-temperness.