There is a saying that if you get your feet wet in the Nile, you always come back. Before I leave,and whenever that may be, am planning to get completely wet, if this really helps!
There is something about the city, its way of life, its people that endears itself to you, and, you dont want to let go.
A friend of mine, who had lived here for over 10 years, came back for a short holiday, and she kept reiterating how much she misses Cairo. I can completely appreciate it!