I'm going to start this off with two questions. Who is your best friend? Can you live without that person in your life?
You know, we often think that we can't live without our friends. However, we are so wrong. Friendship isn't necessary for survival, it just adds value to survival.
Friendship was something I always thought I couldn't live without, then I moved to India and had no friends. When you have no friends, you learn that you don't need friends to survive. Also, you learn two other things.
You learn that Jesus is the perfect friend, and honestly, you don't need any other friend except Him. You also learn to cherish the friends you do have. No matter what.
So, the answer is: Yes, you can live without your best friend. However, you don't have to! Therefore, cherish every moment you have with them and love them deeply. Just be sure and remember the greatest of all friends, Jesus.