Appreciating what you have!
When ever we have a thing (either object or human) we do not often appreciate it until it slips off our hands or the thing is no more. That is when we know the value of what we have lost.
This happens everywhere, everyday in life to everyone. why is this so?
Simply because we are often blinded by the negative aspect of that person or thing that we do not like. Until that thing is no more available or replaced by another, then you begin to remember the positive side of that person or thing the more and feel what you have missed.
Lets us learn to often see the positive side of whatever we have at hand and appreciate.