Someone once told me everyone you meet is in your life for a moment, for a season, or for a life time. I think that's right, and you never know which category a person is going to fall into when you meet them.
If they are in your life for a moment, enjoy the moment. If someone is in your life for a season, enjoy the season. Remember, the season is not over until you have learned what you were supposed to learn from the relationship.
Some folks are in your life for the duration. These people are the greatest treasures you possess.
A moment, a season, or a lifetime. People are what count most in life.