What does 七年之痒 mean? I looked it up and something about the Seven Year Itch but I'm kind confused. Does it have any deep meaning in Chinese culture?
It means seven years after marriage, both husband and wife would face numerous temptations that would harm their relationship. The seven years is a vague expression, sometimes a couple gets trouble earlier, sometimes later.

There is a movie about this. Wikipedia has some hints too. Its Baidu page tells that it's borrowed from foreign country.



Case Study

There is a perfect case: 潘粵明 與 董潔, matching the definition pretty well.