"Number one rule: Don't get too attached."
"But why?"
"People will leave eventually. They will all leave. That's the painful reality. At the end of the day, you'll be left all alone. All by yourself. Yeah maybe it'll hurt while you are seeing those important persons in your life slowly walking away but remember, someday you'll get over it. You'll learn to love yourself more than anyone else and you'll never let yourself be too attached to anyone anymore. Because the only company you'll have for the rest of your life, is no other than yourself."
